From MozillaZine Knowledge Base
UI (User Interface)
- View→Page Source.
- Navigating to a URL of the form view-source://example.com.
- Context-click (right click) the content area→View Page Source or This Frame→View Frame Source.
View Selection Source
View Source and generated source
The default "View -> Page Source" is available as view source
The generated source of a page after applying styling changes is available with
Pages in category "View Source"
The following 4 pages are in this category, out of 4 total.