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Bug 1790307 - Use modern flexbox in preferences. r=preferences-reviewers,Gijs
This shouldn't have any observable behavior change, but this is the first page that uses modern flexbox layout instead of XUL layout. In practice, this means that various interesting bugs that arise from poor interaction between xul and block / flex / grid should disappear / no longer be an issue for front-end developers. Differential Revision: https://phabricator.services.mozilla.com/D157074