You can install uBlock, but not uMatrix. Many many extensions are banned just because they reviewed ONE extension that they preferred for a certain usecase. For example, for OLED phone night reading, there's the most installed at the time extension "Dark Background and Light text" that offered many customizations and worked on reader mode, and more importantly redish text/links. But too bad, because Mozilla picked the one with NO settings, but a nicer icon (which is literally disney's darth vader, but who cares) called "dark reader" which only have bright blue links and white text (and despite the name do not work on reader mode), and because there is already one extension with "dark mode" they will never whitelist the others, or even provide a setting to enable it on your own.
This is a ridiculous lie, Mozilla has said repeatedly that more extensions are being enabled as support for more extension APIs are added, and it has been true. Several of my extensions which were previously disabled have come back online after updates.
Perhaps it will grow but I'll wait to see that before I believe it.
I'm still waiting very basic and popular extensions (uMatrix anyone?) for SEVERAL MONTHS.
And try to offer community help. Ha!
mozilla have to die for firefox to live.
uMatrix and uBlock share the same base code, and we have uBlock but no uMatrix... it is all so rotten. Almost like mozilla is actively breaking firefox.