Firefox has a new Split View that's useful for this, but you still have to left click and select open in split view (M) then click the link. You also used to be able on some browsers to craft a link that was href="tab1.html|tab2.html", no idea if that's still a thing or if it was limited to "home page" setting.

Thanks for the tip. Didn't know this was added.

I generally open the HN comment link, then click the article link, read it, then click back to read the comments.

I'll see if this split view feature works better for me though, but I think I'd prefer a horizontal split instead of vertical.

I accidentally closed Firefox’s last “you’ve just updated” screen which probably mentioned Split View. Couldn’t re-open it. It’s not this https://www.firefox.com/en-US/firefox/153.0.1/releasenotes/ , know if it’s mirrored?

Vivaldi has included split view for years (called tiles). You can also right click a link and choose open in follower tab. This lets all links clicked in one tile open in another tile. I use this regularly on HN.

alt/option-clicking on the desired tab works too