''Tonicat [[#question-1256943|said]]'' <blockquote> I open web developer tool box by click in it in menu but it wasn't fully popup :( </blockquote> Hi Tonicat, if you right-click the Firefox button on the Taskbar, you should find an extra dialog that requires your approval for the Browser Toolbox to make a remote connection to your running Firefox. The dialog should show that your computer is connecting to itself on a different port. Once you approve the connection, the Browser Toolbox window should load its content. Was that it