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Lack of support for specialPowers is often cited as a reason for developers to write mochitests rather than wpt. Although using specialPowers means that the tests can't be upstreamed, having it available in gecko-only tests should reduce the need to write mochitests and potentially means that a patch which previously would be written with just mochitests would instead be written with just wpt, a fraction of which would be unsuitable for sharing. Nevertheless a gecko-only specialPowers-using test should be considered the option of last resort when cross-browser APIs such as testdriver aren't sufficient. This patch installs the specialPowers extension when the path to the XPI is provided via a --specialpowers-path command line argument. To ensure this only happens for gecko-only tests, the url_base is added to the Test object, and the firefox settings() method is updated to contain a specialpowers setting, which uses the url_base of the test to determine if this is a gecko-only test. Because the extension has to be enabled using marionette, we also need to route this setting through the to executor, along with the provided XPI path. Differential Revision: https://phabricator.services.mozilla.com/D92035
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