migrate settings of XPCOM Add-on to WebExtension

sjw at gmx.ch sjw at gmx.ch
Wed Aug 2 12:20:43 UTC 2017

Hi there

What is the easiest way to migrate settings of a pure XPCOM Add-on
(*not* an embedded WebExtension) to WebExtension? Since they can't
access each others storage directly this will be hard to implement in a
user friendly (no action) way.
And is there a way to remove all obsolete entries from prefs.js during
the migration? Or will Mozilla clean up the obsolete extensions.*
entries at some point in the future?
Some extensions have blown up my prefs.js up to some megabytes which is
obviously bad for performance reasons.


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