The fix was merged in Flathub [1] This should be fixed after rebuilding flatpak.
Bug 1825842 Comment 3 Edit History
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The fix was merged in Flathub [1] This should be fixed after rebuilding flatpak. [1] https://github.com/flathub/org.mozilla.firefox.BaseApp/commit/62aea169ed6d4e76ae70ac8052fba426bf65b0b7