Mozilla/5.0 (Windows NT 10.0; rv:55.0) Gecko/20100101 Firefox/55.0 Build ID: 20170426030329 [Affected versions]: - Nightly 55.0a1 [Affected platforms]: - All [Steps to reproduce]: 1. Launch Firefox 2. Open a new tab 3. Type anything in the search field (located on the new tab's content) 4. Press the Down key until you reach the first one-off button 5. Once the first one-off is selected press the right/left keys 7. In the URL bar, click on the Home button 8. Type anything in the search field located in the middle of the Home page 9. Press the Down key until you reach the first one-off button 10. Once the first one-off is selected press the right/left keys [Expected result]: - Steps 5 and 10: Left and Right keys should help you navigate through the one-off buttons. [Actual result]: - Steps 5 and 10: Nothing happens. [Additional notes]: - Navigating using Left/Right keys through the one-off buttons is possible in the Awesome bar and in the Search bar.