Disable `contentReadOnly` and `insertBROnReturn` commands in early beta
builds to collect bugs reports from wider testers.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1782852
Background: These commands are used with `Document.execCommand`,
`Document.queryCommandEnabled`, `Document.queryCommandIndeterm`,
`Document.queryCommandSupported` and `Document.queryCommandValue`, but
they are Gecko specific commands. They have already been disabled in the
Nightly channel since 96 (about 10 months ago)
<https://bugzilla.mozilla.org/show_bug.cgi?id=1706266>, but we don't
have any bug reports of breading the web apps in the wild. However,
telemetry in the beta channel tells us that these commands are still
used in the wild (the number of ping over 1k per day). If these commands
are used only for finger printing, we can delete them, but if these
commands are used for feature detection, we need to keep supporting them
at least returning `true` or something. For getting regression reports
wider than only our Nightly users, I'd like to disable them in the early
beta builds too.
--
Masayuki Nakano<[email protected]>
Working on DOM, Events, editor and IME handling for Gecko
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