Mine too! You could probably target via the list (li) great-great-grand-parent element 18 lines above the highlight, but that seems like a lot of work (as in "googling to find out how to do that"!).
Probably easier to grab all the links on the page and extract everything pointing to Slack -- and a quick google on that led straight back to this Forum 
@ComplexPoint will be round to correct my typos soon, but this might work (testing is a little difficult, obviously!):
Grab Slack Link(s).kmmacros (2.4 KB)
If I've got that right it should give you a list of the page's Slack links, one per line, which you can use in a "For Each" action to open them in new Chrome tabs/windows.