Make sure Torbutton and Tor Launcher are not treated as legacy extensions
We should avoid that Tor Launcher and Torbutton get treated as second class add-ons due to them still being based on XPCOM (e.g. getting shown on a separate add-on panel and not listed on the default about:addons page).
Setting extensions.legacy.enabled to true and adding the extensions IDs to extensions.legacy.exceptions should fix that.
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