All links generated in Slack take you to this intermediate step. Slack requires this page to figure out your user agent / operating system and accordingly triggers a URL handler. If you want to open these links in the web version, then you need to click again on
open this link in your browser. You can save this extra click by using a nifty trick:
You can change your user agent to Chrome on Chrome OS. (For different browsers there are various user agent switcher extensions available)
This is the user agent string you can use:
Mozilla/5.0 (X11; CrOS x86_64 10066.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Safari/537.36
After making this change, Slack will still have the intermediary page, but it'll automatically redirect you to the web version from there.
This doesn't cover all the cases but all the links in the Slack sidebar take the following format:
if you replace
messages, then the link opens in the web version directly.
You could devise some keyboard ninja techniques to make this replacement happen automatically once you copy it into your clipboard.