Hi ruana.m7, sorry to hear about this problem.

How long have you been running Firefox on your system?

Firefox Version

I notice your Firefox identified itself as version 78.0. This could mean any of the following. Do you know which one it is?

• You have never updated from Firefox 78.0
• You are running the "Extended Support Release" of Firefox 78 and you are getting updates in that series
• You are running Firefox 83.0 but you use the privacy.resistFingerprinting setting which overrides your version identification

To get a clearer picture, you could look at the version on the Troubleshooting Information page. Either

• "3-bar" menu button > "?" Help > Troubleshooting Information
• (menu bar) Help > Troubleshooting Information
• type or paste about:support in the address bar and press Enter/Return

In the first table on the page, there should be a row for Version. What does yours say?

Profiles Folder Contents

Firefox data is stored in profile folders under a hidden path. On the Troubleshooting Information page, there's a row in the first table for Profile Folder. The location should be something along the lines of the following, where the last part varies:

[Library]/Application Support/Firefox/Profiles/abcd1234.default-release

Click the "Show in Finder" button on that row and take a look at the contents of the Profiles folder. How many different folders do you find here?

I've figured out on how to find the backup files on my computer. Thank you for your feedback!