This morning, I launched Slack from the program list. Once it was up and running, I clicked a link therein, which launched Firefox. In fact, it launched four Firefox windows, each with many tabs, because Firefox remembers my previous session, and I'm disorganized like that.
However, in the program switcher (Alt+Tab), the Firefox windows are bundled in with the Slack window. So too in the launcher bar, where the Firefox icon shows with no dots underneath, and the Slack icon with five. I visited
about:profiles in Firefox and restarted the program, but it’s still associated with Slack.
I often start Firefox by clicking a link in an email, but I’ve never had it grouped in with Thunderbird. I often start Slack from Firefox, by opening the Slack webapp, and selecting the “Open the Slack App” option therein. This sometimes causes Slack to be grouped within the Firefox windows (the opposite of what I have today).
I find this somewhat irritating. Is there an easy way to fix it? Should I be reporting this as a bug instead of / as well as asking about it here?
$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.3 LTS Release: 18.04 Codename: bionic