You have 20 extensions that were "approved" by mozilla more than a year ago! All the others are banned forever.
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.
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.