fix tslint errors | #1657

Author: Tom J

extension/chrome/elements/pgp_block.ts

@@ -501,7 +501,7 @@ Catch.try(async () => {
         console.info(e.data);
         await renderErr(Lang.pgpBlock.cantOpen + Lang.pgpBlock.badFormat + Lang.pgpBlock.dontKnowHowOpen, e.data);
       } else if (Api.err.isInPrivateMode(e)) {
-        await renderErr(`Error: FlowCrypt extension cannot communicate with its background script to decrypt this message. 
+        await renderErr(`Error: FlowCrypt extension cannot communicate with its background script to decrypt this message.
         On Firefox, this is commonly caused by the Private Browsing Mode or the use of Firefox Containers.`, undefined);
       } else {
         Catch.reportErr(e);

extension/chrome/settings/fatal.ts

@@ -23,7 +23,7 @@ const dbCorruptedHtml = `
   <p>Email [email protected] if you need any help.</p>
 `;
 
-const checkFfSettings = `If you are on Firefox, check that <b>indexedDB.enabled</b> is set to <b>true</b> in browser about:config 
+const checkFfSettings = `If you are on Firefox, check that <b>indexedDB.enabled</b> is set to <b>true</b> in browser about:config
                         or check if Firefox remembers history in <b>Options/Preferences</b> -> <b>Privacy & Security</b> -> <b>History</b>.`;
 
 if (reason === 'db_corrupted') {

extension/js/common/api/api.ts

@@ -319,7 +319,7 @@ export class Api {
         && !Api.err.isBlockedByProxy(e);
     },
     isInPrivateMode: (e: any) => {
-      return e.message.startsWith('BrowserMsg() (no status text): -1 when GET-ing blob:moz-extension://');
+      return e instanceof Error && e.message.startsWith('BrowserMsg() (no status text): -1 when GET-ing blob:moz-extension://');
     }
   };