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The product experience migrating a profile when a non-MSIX Firefox is running is not ideal, so we're going to always start with a fresh profile for simplicity. This is a straight backout of the "meat" of Bug 1709969 - Migrate from an existing profile when running from an app package for the first time, namely `hg backout -r 5136d2f684012dc3d586dcb10374f8c6eda8b6d7`. The changes from follow-up Bug 1723298 (correcting test failures on devedition), namely revision a4bca433c8f7003a90fda61248f38d9b389c394e, were manually reverted and the test files deleted. Differential Revision: https://phabricator.services.mozilla.com/D129066
An explanation of the Firefox Source Code Directory Structure and links to
project pages with documentation can be found at:
https://firefox-source-docs.mozilla.org/contributing/directory_structure.html
For information on how to build Firefox from the source code and create the patch see:
https://firefox-source-docs.mozilla.org/contributing/contribution_quickref.html
If you have a question about developing Firefox, and can't find the solution
on https://firefox-source-docs.mozilla.org/, you can try asking your question on Matrix at chat.mozilla.org in `Introduction` (https://chat.mozilla.org/#/room/#introduction:mozilla.org) channel.
Nightly development builds can be downloaded from:
https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/
- or -
https://www.mozilla.org/firefox/channel/desktop/#nightly
Keep in mind that nightly builds, which are used by Firefox developers for
testing, may be buggy.