When I open a jpg image in a new tab and try to use the Zoom Controls on the custom toolbar: On one of my desktop PCs the Zoom Control will function to enlarge the image if I click the + button and restore it to its original size if I click 100%. On my other desktop PC the Zoom Control functions properly on text such as this, etc., but does not enlarge jpg images. Both PCs are running the most current version of Windows, both are running the most current version of Firefox Nightly. Displays and display cards are different. Not sure if this is a bug report, or I missed a settings adjustment. Michael