Are you a developer? If not then the only thing you need to know is that Mozilla is essentially announcing enabling desktop extensions to be able to work on mobile

Firefox Mobile supported add-ons for many years, but due to having to change some things under the hood a few years ago, add-ons got restricted a bit (though you could still use them).

They're basically announcing they finally fixed the issue and they're coming back.

Firefox for Android previously only supported a limited number of select extensions. They're finally opening it up so you can use any extension.

They don't spell this out, but my interpretation is that extension devs will be able to publish extensions for use on Android, without Mozilla explicitly approving each one of them.

Many desktop extensions work as-is on Android, so when this goes live, we'll likely see dozens, if not hundreds, of extensions becoming available in the following weeks.