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Firefox Portable cant launch after using Firefox's internal upgrader

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c933103
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Firefox Portable cant launch after using Firefox's internal upgrader

Environment:
Win 11 non-administtrator account
Portable apps directory located on Desktop under user directory

Steps to reproduce:
1. Download and install Firefox Portable (Including beta and nightly) from portableapps.com's app launcher's "Portable App Directory"
2. Run it
3. Go to help, check for update, download and install
4. Restart Firefox

Expected behavior
Firefox starting normally (Same as in Win 10 etc)

Actual behavior
It would not launch, process name would appear in task manager for a few seconds, but then disappear

Note
1. It wouldn't be possible to uninstall/delete the unlaunchable Firefox instance either, with everythings under /FirefoxPortable/Data/profile/ being requiring administratior permission to delete, unless first moved to other locations
2. It would happen even when Firefox is at other location and even without updating, although not immediately

John T. Haller
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Joined: 2005-11-28 22:21
Firefox Installed, Enabled Update Service?

Do you have Firefox installed locally and did the enable update service in about:config somehow get set to true within Firefox Portable?

UPDATE: I can't reproduce this on Windows 11 64-bit even with Firefox installed and changing the portable version's about:config setting to use the service.

Sometimes, the impossible can become possible, if you're awesome!

c933103
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Last seen: 2 hours 6 min ago
Joined: 2026-04-21 23:34
No local firefox installation

No local firefox installation
I didn't check auto update service, but I went to Menu > Help > About Firefox > Update

Edit: Also, looking at about:profiles, despite being installed via portableapps launcher, all firefox profiles are using AppData\Roaming\ and AppData\Local\ for unknown reason

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