Screenshot? See this support article. [https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem How do I create a screenshot of my problem?] It is best to use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed a maximum file size of 1 MB. Then use the '''Browse ....''' button below the '''''Post a Reply''''' text box to upload the screenshot. ---------------- Or could it be that you hit the F11 key? For Fullscreen mode. https://support.mozilla.org/en-US/kb/how-make-firefox-and-websites-go-full-screen