BTW, this is marked as a regression from bug 1575597 because that's where the wide label was added: https://hg.mozilla.org/integration/autoland/rev/bf6c6df8d211#l5.13 That bug was uplifted to Beta70, so the upcoming 70 release is currently affected (I see MattN ticked that status flag - thanks). [Tracking Requested - why for this release]: Visual regression in Firefox Preferences UI (our preferences search field moving around unexpectedly, as the user types in it), and is a new issue in Firefox70 (due to some new content that happens to be wider than the available space).
Bug 1583985 Comment 3 Edit History
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BTW, this is marked as a regression from bug 1575597 because that's where the wide label was added: https://hg.mozilla.org/integration/autoland/rev/bf6c6df8d211#l5.13 That bug's patch was uplifted to Beta70, so the upcoming 70 release is currently affected (I see MattN ticked that status flag - thanks). [Tracking Requested - why for this release]: Visual regression in Firefox Preferences UI (our preferences search field moving around unexpectedly, as the user types in it), and is a new issue in Firefox70 (due to some new content that happens to be wider than the available space).