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view So Source 0.1.4.1-signed
A script in a html page can modify the URL that you can see in the location bar. If you use this extension then the View Page Source command will be independent of a such manipulation and will be opening the original url.
About this Add-on
Also, the embedded source viewer will notify you when the loaded page is not found in the browser cache. This is applicable for the http(s) protocol.
AFAIUI, if you want to view a page content by the same context menu, the next couple steps can help you: Ctrl+A and the View Selection Source. By the way, this item of the context menu will use an external viewer just as his big brother.
The options dialog let you adjust an external source viewer and verify this settings by the Test button.
This extension is no longer supported. Use Developer Inspector and Storage Inspector via Gear icon.
And this version presents the Brazilian localization.
This add-on is not compatible with your version of Firefox because of the following: