[rb] use file detector for uploading add-ons if one is set

rb/lib/selenium/webdriver/firefox/features.rb

@@ -35,6 +35,11 @@ def commands(command)
         end
 
         def install_addon(path, temporary)
+          if @file_detector
+            local_file = @file_detector.call(path)
+            path = upload(local_file) if local_file
+          end
+
           payload = {path: path}
           payload[:temporary] = temporary unless temporary.nil?
           execute :install_addon, {}, payload

rb/spec/integration/selenium/webdriver/firefox/driver_spec.rb

@@ -42,6 +42,12 @@ module Firefox
                                      page: {width: 30})).to include(magic_number)
           end
 
+          it 'can add and remove addons' do
+            ext = File.expand_path('../../../../../../third_party/firebug/favourite_colour-1.1-an+fx.xpi', __dir__)
+            driver.install_addon(ext)
+            driver.uninstall_addon('[email protected]')
+          end
+
           it 'should print full page' do
             path = "#{Dir.tmpdir}/test#{SecureRandom.urlsafe_base64}.png"
             screenshot = driver.save_full_page_screenshot(path)