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Auto Context is a Firefox Extension.

You can download it from the Firefox Add-Ons site.

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Normally, to bring up the context menu after selecting text, you would right-click on the selected text.

This extension automates the process. After selecting text, the context menu automatically appears:

 

 

There are several ways to turn of auto context. First, you’ll notice the following icon in your status bar:

 

 

Left-click on the icon to turn auto context off:

 

 

To turn auto context back on, just left-click on the icon again.

There is also a toolbar button that performs the same on/off function. To find the button, go to View > Toolbars > Customize. You can then drag the button onto your toolbar:

 

 

Once again, left-click on the toolbar button to turn auto context on/off.

There are lots of preferences that you can play around with as well. Below are screenshots of the Options Window: