https://addons.mozilla.org/en-US/firefox/addon/styl-us/
>disable or enhance various JavaScript scripts
https://addons.mozilla.org/en-US/firefox/addon/ublock-origin...
https://addons.mozilla.org/en-US/firefox/addon/tampermonkey/...
Yeah you can't directly alter scripts being ran (as far as I know?) but you can usually override/extend behavior and can definitely add your own
>add notes and annotations
https://cwmonkey.github.io/greasemonkey/make-note/
(I haven't actually used this one, just first result)
reply
https://addons.mozilla.org/en-US/firefox/addon/styl-us/
>disable or enhance various JavaScript scripts
https://addons.mozilla.org/en-US/firefox/addon/ublock-origin...
https://addons.mozilla.org/en-US/firefox/addon/tampermonkey/...
Yeah you can't directly alter scripts being ran (as far as I know?) but you can usually override/extend behavior and can definitely add your own
>add notes and annotations
https://cwmonkey.github.io/greasemonkey/make-note/
(I haven't actually used this one, just first result)