Redirector can do that

https://addons.mozilla.org/en-US/firefox/addon/redirector/

Example URL: https://lemmy.world/post/241226?scrollToComments=true

Include pattern: ^(?:https?://)(?:www.)?(?:lemmy.world|lemm.ee|vlemmy.net|discuss.tchncs.de|lemmy.fmhy.ml|sh.itjust.works|beehaw.org|feddit.de|lemmy.one|lemmy.ca|lemmynsfw.com|lemmy.blahaj.zone|lemmygrad.ml|lemmy.dbzer0.com|midwest.social|lemmy.sdf.org|programming.dev|aussie.zone|feddit.uk|dormi.zone|startrek.website|feddit.it|feddit.nl|pawb.social|infosec.pub|feddit.dk|slrpnk.net|lemmy.nz|mander.xyz|feddit.cl|reddthat.com|szmer.info|lemmy.zip|lemmy.pt|latte.isnot.coffee|lemmy.kya.moe|dataterm.digital|waveform.social|exploding-heads.com|pathofexile-discuss.com|sub.wetshaving.social|yiffit.net|iusearchlinux.fyi|partizle.com|monero.town|mtgzone.com|lemmyrs.org|pathfinder.social|toast.ooo|lemmy.studio|lemmy.click|lemmy.film|fanaticus.social|lemmy.radio|lemmy.antemeridiem.xyz|lemmy.spacestation14.com|lemmy.eus|possumpat.io|rammy.site|discuss.online|compuverse.uk|lemmy.tf|preserve.games|dmv.social|lemmy.villa-straylight.social|lemmy.perthchat.org|thegarden.land|thelemmy.club|thegarden.land|ash1-lem-i1-u4829.vm.elestio.app|stars.leemoon.network|forum.basedcount.com|diggit.xyz|feddit.ch|r-sauna.fi|lemmy.whynotdrs.org|lemmy.wtf|lemmyfly.org|lemmy.picote.ch|lemmy.podycust.co.uk|picify.podycust.co.uk|bookwormstory.social|terefere.eu|social.fossware.space|lemmy.podycust.co.uk|aiparadise.moe|poptalk.scrubbles.tech|feddit.ro|lemmy.ko4abp.com|suppo.fi|group.lt|booty.world|lemmy.cafe|tucson.social|lib.lgbt|lemmy.srv.eco)/post/(?:s/)?(.*)

Redirect to: https://MyLemmyInstance.com/post/$1

Pattern type: Regular Expression

Description: redirect lemmy instances to my own

replace Mylemmyinstance.com with your own domain.

i scraped the lemmy instances from the join-lemmy instance list. you can add in a instance just bey separating it with | .

Note: this redirector rule will only redirect domains that has "/post/" in the url otherwise it'll just go to the site. i haven't tested any of the instances to see if they use something other than /post/ .

update: i made a mistake because i misunderstood how the federation links work.. i'll try to fix it.