Starting from Firefox 131, released yesterday, text fragments are now cross-browser, aka Baseline (newly available). You can also style the highlighted content with the ::target-text pseudo-element. I’m still getting over the #:~:text= thing, but it might be a good moment to start using it.

https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/131#:~:text=Text%20fragments%20are%20now%20supported