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Re:Firefox marketshare revisited by jhasse on Wednesday July 19, 2017 @03:14PM (#14807024)
Also happens on startup for me and others. See for example this comment from the bug report:

I simply double-clicked the Firefox icon twice quicker than I ever normally would, and the Close Firefox error appears: "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."

Re:Firefox marketshare revisited by digi_owl on Wednesday July 19, 2017 @05:05PM (#14807915)
Indeed. This in particular when launching Firefox in response to opening urls from external sources.

Hit two of those quickly and hello dialog...