And as there are now WebExtension abilities to open search results in a new tab and open bookmarks in a new tab I opened a bug to do likewise for URLs.
And then got invited to dial into the Firefox Addons team's online meeting, which I duly did (using IRC for the first time in about 20 years, and a video-conferencing system I hadn't tried before). It was professionally run, the people were all reasonable, and my bug was approved to be worked on, so I'm hopeful that it'll be available at some point!
Having been using Firefox since it was called Phoenix it was pretty awesome to play even a tiny part in making it better.
Original post on Dreamwidth - there are comments there.