Force external links to open in a new tab

I put this together based on another very similar script (attributed, of course) I found on beehaw that forces external links to open in a new tab. Should work on every Lemmy instance by checking the header. While it uses http*:/// as the match, it only executes any logic if the isLemmy check returns true.

Honestly, this has improved my desktop experience significantly, it was killing me before.

Hope it helps, feedback/suggestions/contributions welcome!

git link: github.com/Djones4822/GM-Lemmy-newTab