User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0 Build ID: 20170127014032 Steps to reproduce: 1. Open any image, should be bigger than viewport. E.g. https://www.mozilla.org/media/img/firefox/firefox-independent-1200.5bd827ccf1ed.jpg 2. The image will be scaled down to fit the viewport. The mouse cursor is showing a zoom icon, click on the image. The image will be zoomed. The new zoom indicator won't change. The cursor is now zoom out. 3. Press Ctrl+Plus one or several times. The image will be zoomed more, the zoom indicator pops up and shows 110% or higher. 4. Click the image again, it will be scaled to the viewport, since the cursor is zoom out. The cursor will go to zoom in again, but the zoom indicator stays at 110%. Actual results: The zoom indicator stays, even after the image being zoomed out with the zoom out cursor on images. Expected results: The zoom indicator should hide, since the image reached it's original size after page load.

Thank you for the report, the issue is being tracked in bug 1318830.