Why don't we just turn off MOZ_BLOCK_PROFILE_DOWNGRADE?

Magnus Melin mkmelin+mozilla at iki.fi
Tue Jul 2 11:47:42 UTC 2019

Worth considering. However, while the option exists, if it's not used in 
Firefox then there's no knowing if/when/what disabling it will break...

The feature was created on the premise that internal data storage (db 
such) doesn't work well with downgrading, when the database structure 
changed. Since there is no backward compat promise of any sort, but 
rather the opposite, I'm also concerned downgrade attempts would 
increasingly mess up your profile data.

Open to other ideas for solution if opening the Profile Manager is 
difficult. Maybe it's enough to add a link to a support article.


On 02-07-2019 06:16, Geoff Lankow wrote:
> (That's the "You’ve launched an older version of Firefox" dialog.)
> In bug 1535116 <https://bugzilla.mozilla.org/show_bug.cgi?id=1535116> 
> we've proposed to change the text in the dialog to better suit 
> Thunderbird. That's easy enough.
> Magnus also wants me to change the "Create New Profile" to instead 
> open the Profile Manager. That's not as easy as it sounds. The proper 
> way to do it is through nsAppRunner.cpp. We're in a pre-startup state 
> (although we do have XPCOM). Technically we /could/ show the Profile 
> Manager window and mimic the expected results, but I'm not comfortable 
> with that.
> I digress. My point is: why do we have this thing at all? Is there a 
> good reason we want to go to these lengths, other than Downgrading Is 
> A Bad Idea™? It can be removed with a one line config change 
> <https://searchfox.org/comm-central/rev/679db3c87c1a356a66433d6c2adf6fca1f20789f/mail/moz.configure#75>.
> GL
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