I tried many options; nothing worked for me.
Firfox is my default browser but slack opened links Opera. So i uninstalled Opera. Then slack opened links in Chrome.
Here is what i did that worked for me.
- I use Kubuntu and firefox is already the default browser (verified from firefox’s settings)
- I want slack to open links in firefox
- Open System Settings -> Applications -> Default Applications
- Select Firefox as the default for Web Browser.
Now slack opens links in firefox.