Installable in Android Firefox, *does not do anything*.

No .txt file is created, that my File Commander app can find, anywhere.

I tried telling it to open it right afterwards, and that just opened a file-browser, but there was no .txt file to open, so that was pointless.

Firefox removed our ability to bookmark all tabs, a few years ago ( possibly by breaking all the existing addons ), and we STILL need this functionality.

Maybe this works only on some specific operating-systems?

It doesn't work here, though.