Hi,

It is a new tool in Firefox which can also be accessed via Tools ('Alt + T) > Web Developer > Inspect. Pressing Esc will close it. Please also see this.

Thanks Vivek.Wilfred. The odd thing which puzzled me is that my XP computer does not have this quirk but my Vista does. Both are FF10 enabled. That is why I sought help on this item.

FWIW, congratulations on your considerable work in resolving problems here on this board. Thanks for taking the time to resolve this issue.

Thank you. You are welcome :)

The XP installation should also be having this in the right-click context. As you have mentioned, it could be another add-on with similar functionality that has disabled this context menu item in XP or perhaps the right-click has been modified by Disable or replace context menus in Tools > Options > Content > Enable Javascript > Advanced.

"Inspect Element" is a new item that is added in Firefox 10.
Previous Firefox version do not have the build-in inspector.

• http://www.mozilla.org/en-US/firefox/10.0/releasenotes/

Inspect tool with content highlighting, includes new CSS Style Inspector

You can hide that context menu entry by setting the devtools.inspector.enabled pref to false on the about:config page.

• http://kb.mozillazine.org/about:config

Thanks cor-el for pointing out where it is in about:config

For the record, the Inspect Element item in your contextual menu is not a "quirk". It's actually a very powerful tool if you are a Web developer or Web designer. :)