Find preference name listed as "dom.event.contextmenu.enabled" and double-click to toggle it to "false".
Click this box to toggle modal control on and off.
Click the button to toggle Accept Cookies to Off.
Click the "eye" to toggle the visibility for that layer either on or off.
Now that the box has been inserted, you can click it once to toggle whether or not it's checked.
Click the Clipboard button next to the Search bar, select "Bookmarks Toolbar", and then click "View Bookmarks Toolbar" to toggle it on or off.
You may have to click the button twice to toggle through the 3 different game modes.
Click the broadcast button to toggle the stream on and off.
You can click on the icon to toggle whether or not Greasemonkey is enabled.
Many of them over the years have had some sort of "action button" that allowed you to toggle or click to change drawing modes, invoke erasers or pallets and generally save you from having to move away from your drawing surface as much as possible.
