Use Firefox 77.0.1 snap on Ubuntu 18.04
Visit https://commons.wikimedia.org/wiki/Special:UploadWizard
Click on “Select media files to share”
Expected
File open dialog to pop up
Actual response
Nil
Use Firefox 77.0.1 snap on Ubuntu 18.04
Visit https://commons.wikimedia.org/wiki/Special:UploadWizard
Click on “Select media files to share”
Expected
File open dialog to pop up
Actual response
Nil
Similarly Firefox 76.x.x snap fails as well, but Works with firefox 68.9.0 esr/stable (snap)
Mozilla bugs directed me to report here. Please see https://bugzilla.mozilla.org/show_bug.cgi?id=1647047