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I use XUL/Migemo which marks matches in a similar way to what you describe and also allows a a regex search. It also has some Japanese language features (but I'm not interested in those).

Thank you so much! While XUL/Migemo seems to have problems with current FF versions, someone there linked Fastest Search [1] and it has everything I wanted plus way more (including RegEx).

[1] https://addons.mozilla.org/en-US/firefox/addon/fastest-searc...

Great find, I've been looking for something like this too.

I use Scrollbar Search Highlighter: https://addons.mozilla.org/en-US/firefox/addon/scrollbar-sea... It does pretty good job.

I agree. I wonder why FF doesn't just do this by default.