The reason was that it didn't have enough users and it costed resources to maintain and develop (despite Mozilla's- how many developers?- that needlessly removed GTK theming support from their apps). Personally I don't like web apps due to their memory footprint, so for the only times I use them, I just search it up.

I seriously do hate that Firefox is going to be my only option on a couple of months for ad blocking.

It isn't. uBO Lite and Adguard are already enough to block most ads since Google increased the adlist-without-extension-update-limits a bunch of times.

As for all the forks out there, they usually don’t have a mobile equivalent to go with them so they’re only half decent to me.

Waterfox recently launched their Android version