Firefox uses the Web Extensions standard, just like Chrome. There are minor differences here or there but largely the same, tech wise.
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions
A place to discuss the news and latest developments on the open-source browser Firefox
Firefox uses the Web Extensions standard, just like Chrome. There are minor differences here or there but largely the same, tech wise.
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions
Now this makes me mad, I mean, if it was super complex and you had to start from scratch, I can understand someone not doing the work to create it for firefox, but this doesn't make sense :'(
To doing an fork you have to be ready to answers to issues, users, and you have to maintain it in the time. An fork isnt just an copy pasta dude.
You don't have to bring out a product with customer support just because you've made small changes, everyone is free to not use it.
I can't help you with your problem, just wanted to note that Firefox is not the only non-chrome browser out there. The big one is Safari, which is it's own thing based on the Webkit rendering engine. But there are others aswell. Iirc the standard browser that comes with GNOME is also based on Webkit, and there are a few Firefox forks (like the previously mentioned Waterfox or the Mullvad Browser) out there.