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[Virtual_ManPL]

P5 is just long term WONTFIX'ing, useless contributor will provide not complex patch.

[GHM113]

@Virtual_ManPL Kevin Jones wrote a patch and landed this P5 bug in central:
https://bugzilla.mozilla.org/show_bug.cgi?id=1377733
So I guess that means Mozilla fixes P5 bugs if someone else does all the job.

[Virtual_ManPL]

@ GHM113 - Yes, that what I meant in my post,
that Mozilla developers will only review not complex patch created by contributor,
not involving themselves in other way in it.

So in short/tl;dr
P1 = have to be fixed in this release/iteration by Mozilla developer
P2 = have to be fixed in next release(s)/iteration(s) by Mozilla developer
P3 = will be fixed later/soon™ by Mozilla developer, in simply on very long Mozilla developers backlog/To-Do list
P4 = maybe will be implanted, but only if external contributor will provide patch, as no Mozilla developer will be working on it (except reviewing patch(es))
P5 = not likely to be implanted, but if external contributor will provide patch, Mozilla developer might review patch(es)
and there could be exceptions or changes in minds