Why has the back button stopped working?
The back button no longer allows me to return to a previous page
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
See:
This can also be a problem with the file places.sqlite that stores the bookmarks and the history.