I wasn't able to figure out how to run it on any lemmy instance
Lemmy
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Because it only works via the Mlmym frontend, supposedly. Give it a go: https://o.opnxng.com/lemmy.nicknakin.com/
I haven't tested it myself. I hate scripts with dodgy website checks. The author should have hardcoded the known Mlmym instances instead. (or maybe that's just a "me" problem.)
inb4 but this way the script needs less maintenance
If the Mlmym dev renames the "spacer" or "icon" classes for any reason or if he changes Mlmym's HTML structure, this script would stop working immediately.
And anyway, running a check on every page your browser visits to determine if it is a Mlmym instance or not is simply inefficient and, I'd argue, bad practice, security-wise.
It says on the github page that it works for both lemmy-Ui and Mlmym.
Oh, indeed! I missed the fact there was a second script. So there's one for Mlmym and another for "regular" Lemmy instances. My bad.
(It's still got the @match https://*/*
that I dislike, though.)