Comment 22 for bug 1835024

User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Steps to reproduce:

It's been reported several times on https://forum.snapcraft.io/ that when invoked from an application packaged as a classic snap¹ to open a hyperlink, firefox installed as a deb package (on Debian/Ubuntu) opens with the wrong profile by default.
This issue was investigated in https://launchpad.net/bugs/1835024, and we found out that the culprit is nsToolkitProfileService::IsSnapEnvironment()².

To reproduce the issue, ensure that a firefox window is open, then from a terminal run `SNAP_NAME=foobar firefox http://example.org`.

¹ https://snapcraft.io/docs/snap-confinement
² https://hg.mozilla.org/mozilla-central/file/tip/toolkit/profile/nsToolkitProfileService.cpp#l1838

Actual results:

This opens the requested URL (http://example.org) in a separate firefox window, with a different profile than that of the already open firefox window.

Expected results:

This should have opened the requested URL in a new tab in the same window that was already open.