Can I have the old version back ?
this new update (on july 6, 2020) is a lot slower and make text selection impossible on some pages, as it makes the highligh selection to show only after 2 to 3 seconds
--- update ---
Finally, after testing all combinations, it seems that it is a Firefox issue more than coming from this extention. I uninstalled all plugins/extensions and I still had the issue.
But it doesn't explain why it was working a day before while this was the only extension that had an update on the 7th of july.
Also, it doesn't explain why the "Owl" extension solves the issue when activated.

Perfect add-on. Now fast enough for daily usage

Good ADD-ONS