You can absolutely do this in Firefox. Here is a guide on mozilla.org from 2006: https://www-archive.mozilla.org/docs/end-user/keywords.html
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I did a couple of test and it didn't give me any useful results, and I'm subscribed to many group who use the keyword in their name.
For now I think that lemmy internal search is way better.
Yeah it's no replacement for "site:reddit.com", but it could be due to there not being that much content on Lemmy at the moment.
When searching for single words (I tested with "jellyfin" and "dnd") I can find results no problem, but the more specific queries that I would previously do with reddit (eg. "dnd point buy") turn up nothing useful.
I mean lemmy internal search. Anyway evrething is moving so fast, i'll test it again in a couple days.