FF 24 and no context option.
I'll keep watch for an update that works...
Thanks for leaving the comment.
The context menu option is always there. Just remember that the option is available in the context menu, only when right clicked on a TEXT AREA field.
Please follow the screen shots. If you still cannot see the option, let me know your Firefox version and OS name & version.
Sorry, but i can't find the function to format. It is only one button in Menu/Extras, without function!
I have tested using FireFox 17.0.1 & I can format xmls in text areas.
You can only see the option, when you right click on a textarea.
If you have done so & could not see the option -- 'Format XML', please check if the addon is enabled & also try restarting Firefox or re-installing the addon.
If you still cannot see the option, please let me know your Firefox version & OS