You'been answered already about the support periods in Android, but let me add more for you (and others mentioning support times of the system): in Android this problem doesn't exist to begin with. The fact that getting a new web browser version is anchored to getting a whole new operating system version, is preposterous and absurd, pure planned obsolescence from Apple. You would just upgrade your Chrome, Brave, Firefox, or whatever browser app, and do with them what your were trying to do. (in this case install a browser extension, for which the best one qould be Firefox).

This situation with iOS sounds as ridiculous as if it was mandatory to upgrade from Windows 10 to Windows 11 in order to update the Edge browser. (Edited to remove useless rant)

9 year old phone? Don't worry, google won't care about you either.

I gotta say, using full fat uBlock Origin in Firefox on my android is pretty great.

I don't know which version of the iPhone SE you have, there have been several over time. Mine is from 2016 (had to look that up). No update to iOS 18, true.

In your specific case you have to look very carefully in the Android world to avoid an even worse situation. I think there are a few Android models now that promise several years of updates, remains to be seen, though. If this is your beef with Apple, then I doubt you will feel much better with Android.

Apple has way better backwards compatibility than Android. Your 9 year old iPhone SE is still getting security updates.

iPhone SE 1st edition?

2nd edition here, and I updated to 18.6 days ago.