This is a new scam, the site is designed to ask that question incessantly until you give up. Most users end up killing the browser in the Windows Task Manager. At that point, if you restart normally, Firefox will try to load your previous tabs and windows, bringing back the problem. It's frustrating. ---- I've heard of two workarounds to break the cycle: # Disable JavaScript or # Change the post-crash behavior to present a list of tabs instead of loading them all automatically ''Disable JavaScript'' (1) In the new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful. (2) In the search box above the list, type or paste '''java''' and pause while the list is filtered (3) Double-click the '''javascript.enabled''' preference to switch it from true to false. This may or may not affect the already open tab, but when you kill Firefox and restart it, the scripts that prevent you from closing that tab should not be able to run. After closing it, you can go back into about:config and turn JavaScript back on. ''Change Post-Crash Startup setting'' (A) In the new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful. (B) In the search box above the list, type or paste '''sess''' and pause while the list is filtered (C) Double-click the '''browser.sessionstore.max_resumed_crashes''' preference and enter 0 (that's a zero) and click OK. ---- Also, please see this thread for more information and a longer-term workaround: * [https://support.mozilla.org/en-US/questions/964820 how can i disable the message "leave page / stay on page"] - add-ons to prevent pages from messaging you before you leave