Firefox Taskbar Icon Issue - Quick Fixes

Restart Firefox: Close and reopen Firefox to see if the issue resolves.

Clear Icon Cache: Delete IconCache.db in C:\Users\YourUsername\AppData\Local and restart your computer.

Create New Shortcut: Make a new Firefox shortcut on your desktop, then pin it to the taskbar.

Reinstall Firefox: If problems persist, consider reinstalling Firefox after backing up your bookmarks.

Check for Updates: Ensure both Windows and Firefox are up to date for compatibility.

System File Checker (SFC) Scan: Run sfc /scannow in Command Prompt as an administrator.

@jeffrey johns thanks for your reply!

i did all of what you have suggested (currently running system file checker), i tried looking for iconcache.db but couldnt find it?

after the sfc i plan to try a reinstall though

EDIT sfc found corrupt files but fixed it, and i restarted but the problem still exists guess next step is a reinstall

solved by following the steps here to delete the icon cache

https://superuser.com/a/879297

I found a different solution for this.

Tried all these steps including the chosen solution, FFX icon remained as the ONLY icon missing on a new laptop. Scanned Windows for any issues (Sfc, dism, no issues), rebuilt icon cache, disk cleanup, chkdsk, icon cache cleaners, nothing. Reinstalled Firefox, nothing.

Firefox icons loaded correctly everywhere except for the taskbar. It even showed correctly on the right click menu. I even tried assigning a different icon to the Firefox shortcut and it still showed as blank!

Then I found this article: https://www.minitool.com/news/windows-11-taskbar-icons-showing-blank.html which had different instructions for clearing the cache.

It turns out there is an additional icon cache at %userprofile%\AppData\Local\Microsoft\Windows\Explorer, with many iconcache* files that needed to be deleted in order for the icons to come back! I had to use PowerToys File Locksmith tool to unlock the files as they were held by two different system processes (Explorer.exe being one of them).