fix: workaround for 1660564 in some cases lead to blank sidebar

src/services/windows.actions.ts

@@ -27,6 +27,11 @@ export async function loadWindowInfo(): Promise<void> {
   const currentWindow = winData[0]
   let uniqWinId = winData[1] as string | undefined
 
+  // Workaround for https://bugzilla.mozilla.org/show_bug.cgi?id=1660564
+  if (currentWindow.type !== 'normal') {
+    throw 'This code should not be launched in a window with a type other than "normal"'
+  }
+
   // Generate unique window id
   if (!uniqWinId) {
     uniqWinId = Utils.uid()

src/sidebar/sidebar.ts

@@ -27,10 +27,6 @@ import { Snapshots } from 'src/services/snapshots'
 import { updateWebReqHandlers } from 'src/services/web-req.fg'
 import { initUpgrading, showUpgradingScreen } from 'src/services/upgrading'
 
-if (document.body.offsetHeight === 0 && document.body.offsetWidth === 0) {
-  throw 'Sidebar: Not enough space: 0px / 0px'
-}
-
 async function main(): Promise<void> {
   Info.setInstanceType(InstanceType.sidebar)
   IPC.setInstanceType(InstanceType.sidebar)