Extensions can't be verified using the old certificate built into Firefox versions before 115.13.0esr or 128.0. If you want to stick with Firefox, you can update to the Extended Support Release of Firefox 115 (the last series for Windows 7). https://www.mozilla.org/firefox/all/desktop-esr/

I'm guessing from your version number that you did not like the "Proton" user interface redesign in Firefox 89 that changed how tabs looked. There are some workarounds for that involving custom style rules (userChrome.css) if you need to restyle a newer version of Firefox.

Forgot to add a link to the support article: Update Firefox to prevent add-ons issues from root certificate expiration.

thank you, sir. If you are suggesting that I fall for this "update/upgrade" scheme, then that is totally beyond consideration. I have no idea what 89 or 99 are but I reached the age of reason at some point years ago just like many many others who still have a couple of working brain cells.

We had a long and detailed discussion about that scheme here and in other places many years ago.

I simply refuse to believe that this product is made by a group of people who trade their time for nothing out of the goodness of their heart. It just totally contradicts human nature and the very basic instinct of survival. The most obvious evidence is this "version" scheme. Even if that's true and they don't eat but do photosynthesis for energy laying down at some beach, they won't survive long because they'll be eaten by other predators. Plain common sense.

BTW, what makes 85 better than 62 and worse than 7685? can you give me one minute reason that you truly understand?

Are there version designations with transcendental numbers or complex numbers or Sturm-Liouville partial differential equations? like version a+jb or version sqrt(pi).

Is it like the 6 feet that microbes can not jump because of some complex physics that helped get millions around the world wake up a few years ago?

Who decided that 127 (or whatever) goes with windows "7"? and who (full name, please) decided to turn off the add-ons I had working for years?

I only have windows xp here and the exception of some devices that have 7 or Linux that may sometimes connect to networks and they are great for what an average 21st century human being may need to use them for.

This myth of putting together some code to make a product and keep squeezing money out of it forever and ever (after the sale) is plain dumb and eventually no one will fall for it. When you buy an apple, you eat it, and it is gone, you don't keep going back to the grocer for upgrades to the taste or color, you just move on to other things in your short life.

Finally, I hope that you and other "volunteers" who have "authority" over this text box not to delete my words because it took me precious time to type them.

Hi

You will need to update your copy of Firefox to be able to continue to use those (and any other) add-ons.

(1) Your Firefox 88 had a certificate baked in that was used to verify the digital signatures on add-ons. That certificate expired yesterday and therefore your Firefox no longer trusts any add-ons.

The new certificate is baked into the versions I mentioned before. No one is going to go back and update the certificate in Firefox 88 or other old versions that already reached their "end of life."

(2) Firefox is routinely updated to add new features to try to keep up with other browsers. I agree that a lot of these features are to match strange decisions by Google and Microsoft and would not be my choice. That said, some number of the updates are security fixes for vulnerabilities in past releases like yours.

I don't understand your point that seems to be directed toward paid updates. Updates to Firefox are free.

I know it's a pain to update software, especially if you've put it off for nearly four years and will be confronted with a lot of design changes. Let me know if you need help with that.