Created attachment 8891964 [details] search keyword with custom search engine User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0 Build ID: 20170728100358 [Notes]: - If a suggested keyword is highlighted in the Search Suggestions dropdown, the search will be made for that keyword and not the one written in the Search bar. - The only way to avoid this is to move the mouse around the suggestions (outside the dropdown) and then click one of the Search Engines. - This issue is affecting also Activity Stream. [Affected Platforms]: - All Windows - All Mac - All Linux [Prerequisites]: -Latest Activity Stream system add-on version is enabled on a Nightly profile. - This issue can alco be verified on about:home page. [Steps to reproduce]: 1. Start the browser with the profile from prerequisites. 2. Open a new tab and write something in the AS search bar. 3. Mouseover the search suggestions to reach the Search Engine selection area on the bottom. 4. Click one of the Search Engine icons. 5. Observe the searched keyword. [Expected results]: - The searched keyword is the same with the manually entered one. [Actual results]: - The searched keyword wrongly becomes the highlighted one. [Additional Notes]: - The issue is also reproducible on the Activity Stream Dev version of the add-on.