[plasma-browser-integration] [Bug 442674] New: Extension side-effects on unsupported platforms

[RJVB]

https://bugs.kde.org/show_bug.cgi?id=442674

            Bug ID: 442674
           Summary: Extension side-effects on unsupported platforms
           Product: plasma-browser-integration
           Version: unspecified
          Platform: Other
                OS: macOS
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: Firefox
          Assignee: kde at privat.broulik.de
          Reporter: rjvbertin at gmail.com
  Target Milestone: ---

SUMMARY
Certain browsers, Firefox and Waterfox included have an option to sync
installed extensions across hosts and platforms. One an thus end up with the
Plasma Integration extension installed on, say, Macintosh.

STEPS TO REPRODUCE
1. Launch the browser (Firefox or Waterfox, possibly any other supported
browser) on Mac *from a terminal* 
2. Install the extension (directly or indirectly by installing it on a Linux
host where the browser syncs with the Mac in question)
3. Play a video (e.g. on YouTube)

OBSERVED RESULT
The terminal fills with
```
JavaScript error:
moz-extension://2651658f-3b08-9242-8969-bbac66dafd06/extension-utils.js, line
0: Error: can't access property "postMessage", port is undefined
JavaScript error:
moz-extension://2651658f-3b08-9242-8969-bbac66dafd06/extension-utils.js, line
0: Error: can't access property "postMessage", port is undefined
JavaScript error:
moz-extension://2651658f-3b08-9242-8969-bbac66dafd06/extension-utils.js, line
0: Error: can't access property "postMessage", port is undefined
```
It seems 1 such line is printed for every frame in the video.

EXPECTED RESULT
No such pollution, which must have a performance impact on video playback

SOFTWARE/OS VERSIONS
macOS: 10.9.5

ADDITIONAL INFORMATION
I have hardware acceleration disabled in my browser (Waterfox) on Mac but don't
think that changes anything for this issue.

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