Error: TypeError. JSON stringify is not a function' popping up - how do I stop it?
Hi! Does this problem appear on many different sites or just one?
Do you get this error reproducible on specific web pages?
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
It always appears when I start the computer and, occasionally at other times.
I get that error message whenever I open a new window. I click OK and everything works fine, but nothing works till I click OK. I can live with it, but it's very annoying
Worse is the fact that when I open the Add-ons manager I cannot see any of my extensions or get any new ones, the Get Add-ons page continually saying Loading...
Appearance, Plugins and Dictionaries work fine.
this sounds like the files in your profile folder that store the information about your extensions might have become corrupted. please go to firefox > help > troubleshooting information > profile - show folder... then windows explorer should open up your profile folder. in there look for the files named extensions.ini, extensions.sqlite, extensions.sqlite-journal (and in some cases also extensions.txt, extensions.rdf). delete or rename those files and quit firefox, they will be regenerated the next time you launch firefox.
also see Corrupt extension files
So far so good, thank you very much. I was even able to find an update to an extension which is not compatible with my FireFox update
I still get the stringify error though
P.S. In my History tab, any idea why Recently Closed Tabs and Recently Closed Windows do not show anything?
Make sure that you do not run Firefox in (permanent) Private Browsing mode.
Also check that session restore is enabled.
I never use private browsing, though I double-checked. Likewise session restore is set up, as one might expect. Still no joy