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Privacy Redirect Will Redirect Reddit links in search results to libreddit
(addons.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
LibRedirect does the same thing, and will manage a few more sites.
IIRC, LibRedirect is a fork of Pribacy Redirect after the latter was abandoned for a while
Wow, didn't know about this. Awesome extension!