What is this error code?

I get this weird error code every time I start up Firefox. It's been happening since yesterday. Anyone knows what this means?

missing dir file... can you get online on firefox

I can still get on...



I'll lose my addons though...

Addons take all of maybe 5 minutes to get again?

If it not affecting your life or computer leave was is. or reinstall and get the addon again. Not sure if the firefox.exe has a repair function on the installer program.

update if haven't already
https://support.mozilla.com/en-US/kb/Updating+Firefox#Manually_check_for_updates

I'm at the latest version already...

I might as well re-install Firefox then...