"Torbutton WARN: Version check failed!" should disappear if extensions.torbutton.use_nontor_proxy is true
Many people I know use Tor Browser as better Firefox.
When 'extensions.torbutton.use_nontor_proxy' is true, TorButton should stop version check and error message.
Enabling 'extensions.torbutton.use_nontor_proxy' allows us to use TorBrowser with local proxy/nonproxy like a normal browser.
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