diff --git a/dev/App/User.js b/dev/App/User.js
index 845ee6240..b64437659 100644
--- a/dev/App/User.js
+++ b/dev/App/User.js
@@ -552,9 +552,9 @@ class AppUser extends AbstractApp {
 		// 			aAcounts = AccountStore.accounts()
 		// 		;
 		//
-		// 		_.each(oData.Result['Counts'], (oItem) => {
+		// 		oData.Result['Counts'].find(oItem => {
 		//
-		// 			var oAccount = _.find(aAcounts, (oAccount) => {
+		// 			var oAccount = aAcounts.find(oAccount => {
 		// 				return oAccount && oItem[0] === oAccount.email && sEmail !== oAccount.email;
 		// 			});
 		//
diff --git a/dev/Common/Cache.js b/dev/Common/Cache.js
index 5237a1b3d..a9b6e7256 100644
--- a/dev/Common/Cache.js
+++ b/dev/Common/Cache.js
@@ -1,4 +1,3 @@
-import _ from '_';
 import { MessageSetAction } from 'Common/Enums';
 import { trim, pInt, isArray } from 'Common/Utils';
 
@@ -223,7 +222,7 @@ export function initMessageFlagsFromCache(message) {
 		}
 
 		if (0 < message.threads().length) {
-			const unseenSubUid = _.find(message.threads(), (sSubUid) => {
+			const unseenSubUid = message.threads().find(sSubUid => {
 				if (uid !== sSubUid) {
 					const subFlags = getMessageFlagsFromCache(message.folderFullNameRaw, sSubUid);
 					return subFlags && 0 < subFlags.length && !!subFlags[0];
@@ -231,7 +230,7 @@ export function initMessageFlagsFromCache(message) {
 				return false;
 			});
 
-			const flaggedSubUid = _.find(message.threads(), (sSubUid) => {
+			const flaggedSubUid = message.threads().find(sSubUid => {
 				if (uid !== sSubUid) {
 					const subFlags = getMessageFlagsFromCache(message.folderFullNameRaw, sSubUid);
 					return subFlags && 0 < subFlags.length && !!subFlags[1];
diff --git a/dev/Common/Globals.js b/dev/Common/Globals.js
index 97f67322d..f9f469b63 100644
--- a/dev/Common/Globals.js
+++ b/dev/Common/Globals.js
@@ -1,5 +1,4 @@
 import window from 'window';
-import _ from '_';
 import $ from '$';
 import key from 'key';
 import ko from 'ko';
@@ -152,15 +151,7 @@ export const htmlEditorLangsMap = {
 /**
  * @type {boolean}
  */
-let bAllowPdfPreview = !bMobileDevice;
-
-if (bAllowPdfPreview && window.navigator && window.navigator.mimeTypes) {
-	bAllowPdfPreview = !!_.find(window.navigator.mimeTypes, (type) => type && 'application/pdf' === type.type);
-
-	if (!bAllowPdfPreview) {
-		bAllowPdfPreview = 'undefined' !== typeof window.navigator.mimeTypes['application/pdf'];
-	}
-}
+let bAllowPdfPreview = !bMobileDevice && undefined !== window.navigator.mimeTypes['application/pdf'];
 
 export { bAllowPdfPreview };
 
diff --git a/dev/Common/Selector.js b/dev/Common/Selector.js
index 1e99ebab9..06f62caa0 100644
--- a/dev/Common/Selector.js
+++ b/dev/Common/Selector.js
@@ -180,7 +180,7 @@ class Selector {
 					} else if (0 < aItems.length) {
 						if (null !== isNextFocused) {
 							getNext = false;
-							isNextFocused = _.find(aCache, (sUid) => {
+							isNextFocused = aCache.find(sUid => {
 								if (getNext && uids.includes(sUid)) {
 									return sUid;
 								} else if (isNextFocused === sUid) {
@@ -190,7 +190,7 @@ class Selector {
 							});
 
 							if (isNextFocused) {
-								temp = _.find(aItems, (oItem) => isNextFocused === this.getItemUid(oItem));
+								temp = aItems.find(oItem => isNextFocused === this.getItemUid(oItem));
 							}
 						}
 
diff --git a/dev/Common/Utils.js b/dev/Common/Utils.js
index 936f770be..438963a39 100644
--- a/dev/Common/Utils.js
+++ b/dev/Common/Utils.js
@@ -1018,7 +1018,7 @@ export function selectElement(element) {
 }
 
 export const detectDropdownVisibility = _.debounce(() => {
-	dropdownVisibility(!!_.find(GlobalsData.aBootstrapDropdowns, (item) => item.hasClass('open')));
+	dropdownVisibility(!!GlobalsData.aBootstrapDropdowns.find(item => item.hasClass('open')));
 }, 50);
 
 /**
diff --git a/dev/Model/Filter.js b/dev/Model/Filter.js
index bbec81a7c..c160dbc27 100644
--- a/dev/Model/Filter.js
+++ b/dev/Model/Filter.js
@@ -146,7 +146,7 @@ class FilterModel extends AbstractModel {
 		}
 
 		if (0 < this.conditions().length) {
-			if (_.find(this.conditions(), (cond) => cond && !cond.verify())) {
+			if (this.conditions().find(cond => cond && !cond.verify())) {
 				return false;
 			}
 		}
diff --git a/dev/Model/Folder.js b/dev/Model/Folder.js
index 87ca16e5f..33b63634f 100644
--- a/dev/Model/Folder.js
+++ b/dev/Model/Folder.js
@@ -1,4 +1,3 @@
-import _ from '_';
 import ko from 'ko';
 
 import { FolderType } from 'Common/Enums';
@@ -64,9 +63,8 @@ class FolderModel extends AbstractModel {
 
 		this.hasSubScribedSubfolders = ko.computed(
 			() =>
-				!!_.find(
-					this.subFolders(),
-					(oFolder) => (oFolder.subScribed() || oFolder.hasSubScribedSubfolders()) && !oFolder.isSystemFolder()
+				!!this.subFolders().find(
+					oFolder => (oFolder.subScribed() || oFolder.hasSubScribedSubfolders()) && !oFolder.isSystemFolder()
 				)
 		);
 
@@ -230,9 +228,8 @@ class FolderModel extends AbstractModel {
 
 		this.hasSubScribedUnreadMessagesSubfolders = ko.computed(
 			() =>
-				!!_.find(
-					this.subFolders(),
-					(folder) => folder.hasUnreadMessages() || folder.hasSubScribedUnreadMessagesSubfolders()
+				!!this.subFolders().find(
+					folder => folder.hasUnreadMessages() || folder.hasSubScribedUnreadMessagesSubfolders()
 				)
 		);
 
diff --git a/dev/Model/Message.js b/dev/Model/Message.js
index e8bf9fa45..d0886e94a 100644
--- a/dev/Model/Message.js
+++ b/dev/Model/Message.js
@@ -493,7 +493,7 @@ class MessageModel extends AbstractModel {
 	 * @returns {boolean}
 	 */
 	hasVisibleAttachments() {
-		return !!_.find(this.attachments(), (item) => !item.isLinked);
+		return !!this.attachments().find(item => !item.isLinked);
 	}
 
 	/**
@@ -506,7 +506,7 @@ class MessageModel extends AbstractModel {
 
 		if (isNonEmptyArray(attachments)) {
 			cid = cid.replace(/^<+/, '').replace(/>+$/, '');
-			result = _.find(attachments, (item) => cid === item.cidWithOutTags);
+			result = attachments.find(item => cid === item.cidWithOutTags);
 		}
 
 		return result || null;
@@ -521,7 +521,7 @@ class MessageModel extends AbstractModel {
 		const attachments = this.attachments();
 
 		if (isNonEmptyArray(attachments)) {
-			result = _.find(attachments, (item) => contentLocation === item.contentLocation);
+			result = attachments.find(item => contentLocation === item.contentLocation);
 		}
 
 		return result || null;
diff --git a/dev/Screen/AbstractSettings.js b/dev/Screen/AbstractSettings.js
index 72398f1ce..b483f9209 100644
--- a/dev/Screen/AbstractSettings.js
+++ b/dev/Screen/AbstractSettings.js
@@ -39,17 +39,15 @@ class AbstractSettingsScreen extends AbstractScreen {
 			viewModelPlace = null,
 			viewModelDom = null;
 
-		RoutedSettingsViewModel = _.find(
-			VIEW_MODELS.settings,
-			(SettingsViewModel) =>
+		RoutedSettingsViewModel = VIEW_MODELS.settings.find(
+			SettingsViewModel =>
 				SettingsViewModel && SettingsViewModel.__rlSettingsData && subName === SettingsViewModel.__rlSettingsData.Route
 		);
 
 		if (RoutedSettingsViewModel) {
 			if (
-				_.find(
-					VIEW_MODELS['settings-removed'],
-					(DisabledSettingsViewModel) =>
+				VIEW_MODELS['settings-removed'].find(
+					DisabledSettingsViewModel =>
 						DisabledSettingsViewModel && DisabledSettingsViewModel === RoutedSettingsViewModel
 				)
 			) {
@@ -58,9 +56,8 @@ class AbstractSettingsScreen extends AbstractScreen {
 
 			if (
 				RoutedSettingsViewModel &&
-				_.find(
-					VIEW_MODELS['settings-disabled'],
-					(DisabledSettingsViewModel) =>
+				VIEW_MODELS['settings-disabled'].find(
+					DisabledSettingsViewModel =>
 						DisabledSettingsViewModel && DisabledSettingsViewModel === RoutedSettingsViewModel
 				)
 			) {
@@ -155,18 +152,16 @@ class AbstractSettingsScreen extends AbstractScreen {
 			if (
 				SettingsViewModel &&
 				SettingsViewModel.__rlSettingsData &&
-				!_.find(
-					VIEW_MODELS['settings-removed'],
-					(RemoveSettingsViewModel) => RemoveSettingsViewModel && RemoveSettingsViewModel === SettingsViewModel
+				!VIEW_MODELS['settings-removed'].find(
+					RemoveSettingsViewModel => RemoveSettingsViewModel && RemoveSettingsViewModel === SettingsViewModel
 				)
 			) {
 				this.menu.push({
 					route: SettingsViewModel.__rlSettingsData.Route,
 					label: SettingsViewModel.__rlSettingsData.Label,
 					selected: ko.observable(false),
-					disabled: !!_.find(
-						VIEW_MODELS['settings-disabled'],
-						(DisabledSettingsViewModel) => DisabledSettingsViewModel && DisabledSettingsViewModel === SettingsViewModel
+					disabled: !!VIEW_MODELS['settings-disabled'].find(
+						DisabledSettingsViewModel => DisabledSettingsViewModel && DisabledSettingsViewModel === SettingsViewModel
 					)
 				});
 			}
@@ -176,9 +171,8 @@ class AbstractSettingsScreen extends AbstractScreen {
 	}
 
 	routes() {
-		const DefaultViewModel = _.find(
-				VIEW_MODELS.settings,
-				(SettingsViewModel) =>
+		const DefaultViewModel = VIEW_MODELS.settings.find(
+				SettingsViewModel =>
 					SettingsViewModel && SettingsViewModel.__rlSettingsData && SettingsViewModel.__rlSettingsData.IsDefault
 			),
 			defaultRoute =
diff --git a/dev/Settings/User/General.js b/dev/Settings/User/General.js
index 906703831..aba38fccf 100644
--- a/dev/Settings/User/General.js
+++ b/dev/Settings/User/General.js
@@ -56,7 +56,7 @@ class GeneralUserSettings {
 
 		this.identityMain = ko.computed(() => {
 			const list = this.identities();
-			return isArray(list) ? _.find(list, (item) => item && '' === item.id()) : null;
+			return isArray(list) ? list.find(item => item && '' === item.id()) : null;
 		});
 
 		this.identityMainDesc = ko.computed(() => {
diff --git a/dev/Settings/User/OpenPgp.js b/dev/Settings/User/OpenPgp.js
index 8a2b7824f..9162bb795 100644
--- a/dev/Settings/User/OpenPgp.js
+++ b/dev/Settings/User/OpenPgp.js
@@ -50,7 +50,7 @@ class OpenPgpUserSettings {
 			this.openPgpKeyForDeletion(null);
 
 			if (openPgpKeyToRemove && PgpStore.openpgpKeyring) {
-				const findedItem = _.find(PgpStore.openpgpkeys(), (key) => openPgpKeyToRemove === key);
+				const findedItem = PgpStore.openpgpkeys().find(key => openPgpKeyToRemove === key);
 				if (findedItem) {
 					PgpStore.openpgpkeys.remove(findedItem);
 					delegateRunOnDestroy(findedItem);
diff --git a/dev/Storage/Client.js b/dev/Storage/Client.js
index 285ba8898..28f212fb6 100644
--- a/dev/Storage/Client.js
+++ b/dev/Storage/Client.js
@@ -1,10 +1,8 @@
-import _ from '_';
 import { CookieDriver } from 'Common/ClientStorageDriver/Cookie';
 import { LocalStorageDriver } from 'Common/ClientStorageDriver/LocalStorage';
 
-const SupportedStorageDriver = _.find(
-	[LocalStorageDriver, CookieDriver],
-	(StorageDriver) => StorageDriver && StorageDriver.supported()
+const SupportedStorageDriver = [LocalStorageDriver, CookieDriver].find(
+	StorageDriver => StorageDriver && StorageDriver.supported()
 );
 
 const driver = SupportedStorageDriver ? new SupportedStorageDriver() : null;
diff --git a/dev/Stores/User/Folder.js b/dev/Stores/User/Folder.js
index 159d9a04a..f83bf5743 100644
--- a/dev/Stores/User/Folder.js
+++ b/dev/Stores/User/Folder.js
@@ -47,7 +47,7 @@ class FolderUserStore {
 		);
 
 		this.foldersListWithSingleInboxRootFolder = ko.computed(
-			() => !_.find(this.folderList(), (folder) => folder && !folder.isSystemFolder() && folder.visible())
+			() => !this.folderList().find(folder => folder && !folder.isSystemFolder() && folder.visible())
 		);
 
 		this.currentFolderFullNameRaw = ko.computed(() => (this.currentFolder() ? this.currentFolder().fullNameRaw : ''));
@@ -193,7 +193,7 @@ class FolderUserStore {
 			return 0;
 		});
 
-		_.find(timeouts, (aItem) => {
+		timeouts.find(aItem => {
 			const folder = getFolderFromCacheList(aItem[1]);
 			if (folder) {
 				folder.interval = utc;
diff --git a/dev/Stores/User/Message.js b/dev/Stores/User/Message.js
index 15070af49..8538e5a09 100644
--- a/dev/Stores/User/Message.js
+++ b/dev/Stores/User/Message.js
@@ -380,9 +380,9 @@ class MessageUserStore {
 			if (
 				messageList &&
 				0 < messageList.length &&
-				!!_.find(messageList, (item) => !!(item && item.deleted() && item.uid === this.messageListThreadUid()))
+				!!messageList.find(item => !!(item && item.deleted() && item.uid === this.messageListThreadUid()))
 			) {
-				const message = _.find(messageList, (item) => item && !item.deleted());
+				const message = messageList.find(item => item && !item.deleted());
 				if (message && this.messageListThreadUid() !== pString(message.uid)) {
 					this.messageListThreadUid(pString(message.uid));
 
@@ -633,9 +633,8 @@ class MessageUserStore {
 							this.selectorMessageFocused(null);
 						}
 					} else if (!selectedMessage && message) {
-						selectedMessage = _.find(
-							this.messageList(),
-							(subMessage) =>
+						selectedMessage = this.messageList().find(
+							subMessage =>
 								subMessage &&
 								subMessage.folderFullNameRaw === message.folderFullNameRaw &&
 								subMessage.uid === message.uid
diff --git a/dev/Stores/User/Pgp.js b/dev/Stores/User/Pgp.js
index befa7b877..150e4a6e2 100644
--- a/dev/Stores/User/Pgp.js
+++ b/dev/Stores/User/Pgp.js
@@ -30,7 +30,7 @@ class PgpUserStore {
 	}
 
 	findKeyByHex(keys, hash) {
-		return _.find(keys, (item) => hash && item && (hash === item.id || item.ids.includes(hash)));
+		return keys.find(item => hash && item && (hash === item.id || item.ids.includes(hash)));
 	}
 
 	findPublicKeyByHex(hash) {
@@ -108,7 +108,7 @@ class PgpUserStore {
 	 * @returns {?}
 	 */
 	findPublicKeyByEmailNotNative(email) {
-		return _.find(this.openpgpkeysPublic(), (item) => item && item.emails.includes(email)) || null;
+		return this.openpgpkeysPublic().find(item => item && item.emails.includes(email)) || null;
 	}
 
 	/**
@@ -116,7 +116,7 @@ class PgpUserStore {
 	 * @returns {?}
 	 */
 	findPrivateKeyByEmailNotNative(email) {
-		return _.find(this.openpgpkeysPrivate(), (item) => item && item.emails.includes(email)) || null;
+		return this.openpgpkeysPrivate().find(item => item && item.emails.includes(email)) || null;
 	}
 
 	/**
@@ -142,7 +142,7 @@ class PgpUserStore {
 	 */
 	findPrivateKeyByEmail(email, password) {
 		let privateKey = null;
-		const key = _.find(this.openpgpkeysPrivate(), (item) => item && item.emails.includes(email));
+		const key = this.openpgpkeysPrivate().find(item => item && item.emails.includes(email));
 
 		if (key) {
 			try {
@@ -217,7 +217,7 @@ class PgpUserStore {
 				if (publicKeys && 0 < publicKeys.length) {
 					try {
 						const result = message.verify(publicKeys),
-							valid = _.find(_.isArray(result) ? result : [], (item) => item && item.valid && item.keyid);
+							valid = (_.isArray(result) ? result : []).find(item => item && item.valid && item.keyid);
 
 						if (valid && valid.keyid && valid.keyid && valid.keyid.toHex) {
 							fCallback(this.findPublicKeyByHex(valid.keyid.toHex()));
diff --git a/dev/View/Popup/Compose.js b/dev/View/Popup/Compose.js
index f00103867..69afc53ed 100644
--- a/dev/View/Popup/Compose.js
+++ b/dev/View/Popup/Compose.js
@@ -1263,12 +1263,12 @@ class ComposePopupView extends AbstractViewNext {
 	 * @returns {?Object}
 	 */
 	getAttachmentById(id) {
-		return _.find(this.attachments(), (item) => item && id === item.id);
+		return this.attachments().find(item => item && id === item.id);
 	}
 
 	cancelAttachmentHelper(id, oJua) {
 		return () => {
-			const attachment = _.find(this.attachments(), (item) => item && item.id === id);
+			const attachment = this.attachments().find(item => item && item.id === id);
 			if (attachment) {
 				this.attachments.remove(attachment);
 				delegateRunOnDestroy(attachment);
@@ -1516,7 +1516,7 @@ class ComposePopupView extends AbstractViewNext {
 	}
 
 	removeLinkedAttachments() {
-		const arrachment = _.find(this.attachments(), (item) => item && item.isLinked);
+		const arrachment = this.attachments().find(item => item && item.isLinked);
 		if (arrachment) {
 			this.attachments.remove(arrachment);
 			delegateRunOnDestroy(arrachment);
diff --git a/dev/View/Popup/ComposeOpenPgp.js b/dev/View/Popup/ComposeOpenPgp.js
index e9cfc3002..bb406d4bd 100644
--- a/dev/View/Popup/ComposeOpenPgp.js
+++ b/dev/View/Popup/ComposeOpenPgp.js
@@ -244,7 +244,7 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 	@command()
 	selectCommand() {
 		const keyId = this.selectedPrivateKey(),
-			option = keyId ? _.find(this.privateKeysOptions(), (item) => item && keyId === item.id) : null;
+			option = keyId ? this.privateKeysOptions().find(item => item && keyId === item.id) : null;
 
 		if (option) {
 			this.signKey({
@@ -261,7 +261,7 @@ class ComposeOpenPgpPopupView extends AbstractViewNext {
 	addCommand() {
 		const keyId = this.selectedPublicKey(),
 			keys = this.encryptKeys(),
-			option = keyId ? _.find(this.publicKeysOptions(), (item) => item && keyId === item.id) : null;
+			option = keyId ? this.publicKeysOptions().find(item => item && keyId === item.id) : null;
 
 		if (option) {
 			keys.push({
diff --git a/dev/View/Popup/Contacts.js b/dev/View/Popup/Contacts.js
index 47d5b921b..276df3e72 100644
--- a/dev/View/Popup/Contacts.js
+++ b/dev/View/Popup/Contacts.js
@@ -119,7 +119,7 @@ class ContactsPopupView extends AbstractViewNext {
 				emails = this.viewPropertiesEmails(),
 				fFilter = (property) => '' !== trim(property.value());
 
-			return !!(_.find(names, fFilter) || _.find(emails, fFilter));
+			return !!(names.find(fFilter) || emails.find(fFilter));
 		});
 
 		this.viewPropertiesPhones = ko.computed(() =>
@@ -381,7 +381,7 @@ class ContactsPopupView extends AbstractViewNext {
 	}
 
 	addNewOrFocusProperty(type, typeStr) {
-		const item = _.find(this.viewProperties(), (prop) => type === prop.type());
+		const item = this.viewProperties().find(prop => type === prop.type());
 		if (item) {
 			item.focused(true);
 		} else {
diff --git a/dev/View/User/MailBox/MessageList.js b/dev/View/User/MailBox/MessageList.js
index 377870789..22604ae92 100644
--- a/dev/View/User/MailBox/MessageList.js
+++ b/dev/View/User/MailBox/MessageList.js
@@ -255,9 +255,8 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 		});
 
 		Events.sub('mailbox.message.show', (sFolder, sUid) => {
-			const message = _.find(
-				this.messageList(),
-				(item) => item && sFolder === item.folderFullNameRaw && sUid === item.uid
+			const message = this.messageList().find(
+				item => item && sFolder === item.folderFullNameRaw && sUid === item.uid
 			);
 
 			if ('INBOX' === sFolder) {
@@ -411,7 +410,7 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 				temp = null,
 				current = null;
 
-			_.find(this.messageListPagenator(), (item) => {
+			this.messageListPagenator().find(item => {
 				if (item) {
 					if (current) {
 						next = item;
@@ -942,9 +941,8 @@ class MessageListMailBoxUserView extends AbstractViewNext {
 
 	prefetchNextTick() {
 		if (ifvisible && !this.bPrefetch && !ifvisible.now() && this.viewModelVisibility()) {
-			const message = _.find(
-				this.messageList(),
-				(item) => item && !hasRequestedMessage(item.folderFullNameRaw, item.uid)
+			const message = this.messageList().find(
+				item => item && !hasRequestedMessage(item.folderFullNameRaw, item.uid)
 			);
 			if (message) {
 				this.bPrefetch = true;