Using Version 2.1.1, Firefox 83, Windows 20H2
Works fine for me, i just don't know how to continue the search after the popup is closed.
When I reopen the pop-up window, it remembers to the previous text, but it doesn't work. Currently I modify and undo the modification to make the original search work again.
Is there an easier way to do this?

Please add focus to search panel by call. Also it would be great to start find+ as default search.

Used it a couple of times so far. Does what you expect, type the regex and it highlights the matches on the page, pressing Enter repeatedly jumps to each successive match.

It would be nice after pressing Ctrl-Shift-F to have focus go to the search box. Like that Ctrl-Shift-F is a toggle which returns focus to where you were.

Love being able to use regular expressions in on page searches. Needs a few more usability things as mentioned in this and other review to get 5 stars (at least from me). Good job. Thanks!

Please keep in mind this addon wont work rightaway, on your existing windows, when installed. Either restart the browser, open a new window or close and reopen your existing windows.

That tricked me to believe it didn't work at all.

I'm also missing a hotkey.

(2017-02-22, v1.4.0, Linux Mint system)