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Created attachment 8777872 [details] Dialogue box with "Close tabs" text missing from the button. User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36 Steps to reproduce: Steps to reproduce the issue on Mac IOS 10.11.6 are as follows. 1. Open Firefox 2. Open multiple tabs. 3. Open mac's finder window. 4. Close the finder window (Macs top bar will still be focused on Finder). 5. Now without focusing Firefox window click the red cross to close firefox. Actual results: As you follow the steps above following happens. 1. A dialogue box is displayed with two buttons. 2. Left button has text "Cancel" which is expected. 3. Right button has text "Close tabs" but is suddenly disappears, thus making the right button with no text. Expected results: Warning dialogue box should have two buttons with following text. 1. Left Button - "Cancel" 2. Right Button - "Close tabs"