In the video shown above, you visually SEE "realty.comm" (there's an extra m there which I found very strange, which makes me think this is a bug), but when the person pressed enter, it goes to realtor.com. I expect pressing enter to run the query I see, not for it to change after I press enter.
I don't see 2 ms, at least not in the first example in the video.
I feel like default behaviour should be broadly helpful, while specifically helpful behaviour should be easily accessible but not so easily accessible that a mindless click triggers it.
Even better, the option to set new tab to a webpage is gone. The only choices are the Firefox default page or a blank webpage.
Normally this wouldn't be a problem. I'd just try one of the dozen of known tweaks to about:config or userChrome.css and defeat this behavior. Except none of them impact this.
Again, this is only for a new tab.
FWIW, and as a workaround and not any sort of defense of FF breaking itself: You could, from an existing page, type what you want in the search box, then middle-click (or ctrl+click) the search button, which opens the result in a new tab. Again, you shouldn't have to do this, but it seems like it'd patch your workflow.
The action is a bit distracting but it happens fast enough that it's not a bother.
I'll note it was the 2nd extension I tried. It may be some onerous Firefox security measure needs to be bypassed & the first extension hadn't managed it yet.