On Mon, Mar 13, 2017 at 2:10 PM, Botond Ballo <bba...@mozilla.com> wrote:

> Over time, I have encountered a number of (what I assume are) Firefox bugs
> that:
>
>   - Reproduce in my default profile, even in Safe Mode
>   - Do not reproduce in a clean profile
>
> Since they do not reproduce in a clean profile, I have not been able
> to turn these into actionable bug reports.
>
> Since they do reproduce in Safe Mode, I assume they are not addon-related.
>

First things first, until recently our handling of safe mode in the content
process was busted for a long time (bug 1326245) so be careful how much
that might have shaped your impression.


> Does anyone have suggestions for how to try to turn bugs like these
> into actionable bug reports? When my regular profile is in Safe Mode,
> what differences remain between it and a clean profile, that could
> explain differences in behaviour?


In my experience 99% of such bugs are caused by prefs and I have found
bisecting my user_prefs.js file a very effective way of finding the
culprit.  The sucky part of this solution is that bisecting the
user_prefs.js file is a manual process and we overwrite the file at
shutdown so you need to be careful with that and keep a backup of the file
around, etc.

HTH,
Ehsan
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