On Android at least, Firefox PWA’s don’t seem to support registering system-level things (like ‘Share To’ handlers) - you need to use a Chrome PWA for that…
No Japanese :(
I think this “improvement” is pretty poor - If I’m interpreting your post correctly, I think you can set:
browser.download.improvements_to_download_panel false
in about:config
For me:
browser.ctrlTab.recentlyUsedOrder: False
browser.tabs.insertAfterCurrent: True
dom.popup_maximum: 100
browser.download.improvements_to_download_panel: False
This is just a response to the UCT changes going live in November. Every big corp in Australia is going to be making changes like that.