Load Control is a Firefox extension that adds toolbar buttons that stop loading all tabs or reload all tabs in the current window.
I find this most useful when launching Firefox. I often have multiple tabs that reopen from the last session, and they all try to reload when Firefox starts. The Stop All button lets me pause the loading, and I can get back to the tabs as I need them.
To add the buttons to your toolbar: From the View menu, choose Toolbars, then Customize. You can drag the Stop All and/or Load All buttons to any existing toolbar.
· Mozilla Firefox