Hello! I found some more information here. It seems that the issue is only reproducing if the previous profile was created and used by Firefox Nightly (120.0a1). If for example, I open a profile with Firefox 120.0a1.deb that was created by 119.0b4, 118.0.1 or 115esr the issue does not reproduce. The Firefox .deb is correctly localized based on the downloaded build and region/ language set and the distributionID is correctly displayed in the About Nightly window and about:support.
Bug 1853807 Comment 4 Edit History
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Hello! I found some more information here. It seems that the issue is only reproducing if the previous profile was created and used by Firefox Nightly (120.0a1). If for example, I open a profile with Firefox 120.0a1.deb that was created wit Firefox 119.0b4, 118.0.1 or 115esr the issue does not reproduce. The Firefox .deb is correctly localized based on the downloaded build and region/ language set and the distributionID is correctly displayed in the About Nightly window and about:support.
Hello! I found some more information here. It seems that the issue is only reproducing if the previous profile was created and used by Firefox Nightly (120.0a1). If for example, I open a profile with Firefox 120.0a1.deb that was created with Firefox 119.0b4, 118.0.1, or 115esr the issue does not reproduce. The Firefox .deb is correctly localized based on the downloaded build and region/ language set and the distributionID is correctly displayed in the About Nightly window and about:support.