Prevent Closing Window
Displays the "Leave Page" prompt to avoid accidentally closing the current window. **BUG** To allow Firefox to shut down, click Stay on page and the Close This Tab button before you exit.
Prevent Closing Window - Firefox Add-on
Prevent Closing Window is a Firefox add-on that adds a tab to regular and private windows, prompting for approval before closing the window when clicking the X button.
Add-on stats
Weekly download count: 2
Firefox on Android: No
Risk impact: Moderate risk impact 
Risk likelihood:
Manifest version: 2
Permissions:
- menus
- tabs
- storage
Size: 42.70K
Email: js*****@outlook.com
URLs: Website
Ranking
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
Want to check extension ranking and stats more quickly for other Firefox add-ons?
Install
Chrome-Stats extension
to view Firefox-Stats data as you browse the Firefox Browser Add-ons.
Add-on summary
Adds a tab to a regular window and to a private window. To prevent closing the window when clicking the X button, use one of the Activate Protection options. Then Firefox should ask your approval before closing.
To add the Keep Open tab only in regular windows, or only in private windows, or in all windows, use the Options tab for the extension on the Add-ons page.
User reviews
The Extension Works But It's Annoying That The Tab Auto Opens In The Startup And When You Open A New Tab In A Second Window
by Seikikai, 2024-05-29
Installed this to work with Keevault password manager. It stops logging out of KeeVault unless needed. I created a html launcher to open KeeVault and a blank page when I first open firefox so my logins are ready for use.
by Firefox user 16483648, 2024-04-05
This plugin requires you to have an open tab dedicated to it in every window you open. It doesn't work without that tab. When you open a new window, this plugin can open a new tab, which covers up your new tab page. Noble effort, but too many sacrifices to be useful.
by Firefox user 10266452, 2022-07-05
Add-on safety
Risk impact
Prevent Closing Window requires a few sensitive permissions. Exercise caution before installing.
Risk likelihood
Prevent Closing Window has earned a fairly good reputation and likely can be trusted.
Upgrade to see risk analysis details