These are literally default search extensions from Mozilla that come with every vanilla Firefox install - some basic digging would've told you that (in fact, your very screenshot shows that the extension IDs come from Mozilla). They're what allows the search options for those sites in Firefox. If you go to search settings and turn those search engines off, they have zero effect on you. Or better yet, simply hit "remove" in those settings to completely get rid of them, which makes them no longer show up anywhere, even about:debugging
.
You're welcome to move away from Garuda; it just wouldn't change anything. You could also fork the code to remove the extensions by default, but at that point ask yourself why neither LibreWolf nor the Garuda team found it necessary to remove these extensions by default if they were actually a privacy threat (and again, you could just remove them yourself in 5 seconds through search settings).
Honestly, these default search providers could potentially be removed simply because more privacy-focused users have no reason to use such search engines, but that's something you should take up with the LibreWolf/Garuda team in a polite discussion.
Here, this post could potentially affect Garuda's reputation for something that's completely harmless and is 2 layers upstream from them (FF > LibreWolf > FireDragon). It also makes privacy enthusiasts look silly and paranoid.
I understand why seeing these would make you suspicious, but the next step would be to look it up somewhere rather than jumping to a conclusion.
OP, I'm not trying to scold you (and I'm sorry this comment feels that way) . Rather, this is a reminder to everyone here: please do some due diligence before posting stuff.
(P.S. As someone who once also used this distro and browser, I would also recommend to just setup FF or even LibreWolf the way you want instead of using this specialized distro fork. Not for any malicious reason, but simply because important security updates are bound to come late to a fork of a fork.)