This adjusts both the new Tracking Protection UI and the old Tracking Protection UI on
about:preferences to indicate when an extension is controlling Tracking Protection. It
will disable the controls on about:preferences if an extension is in control, and provide
a button to disable the extension.
MozReview-Commit-ID: G04jWrS6Pr9
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extra : rebase_source : 4cdee73b00b74e25c074e62a872d7b50a984cf8f