As you can see in the screenshot,
1. Firefox is checked,
2. has the proper file path
3. Default Browser is set to "First listed" with Firefox as the path. I also tried system default with Firefox as my default browser.
However, when I press the debug button, a Chrome window still pops up to do the debugging. How do I set Firefox to open up when I hit debug.
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On related note: https://youtrack.jetbrains.com/issue/WEB-14987
In addition to what's written above: unfortunately, there's nothing we can offer for debugging in Firefox now :(
We used to support Firefox Remote Debugging (but without source maps) through the FireFox Remote run configuration, but our solution doesn't work in the latest Firefox versions due to changes in the protocol, and there doesn't seem to be an easy way to fix it. We've made some progress recently, but there are still some blocking issues.
Related tickets: https://youtrack.jetbrains.com/issue/WEB-45986, https://youtrack.jetbrains.com/issue/WEB-48076, https://youtrack.jetbrains.com/issue/WEB-2337