The Page Source shows the HTML that was sent to Firefox from the web server.

This may not be the complete story, because scripts in that HTML may retrieve further information and insert it into the page. To see the final state of the HTML, you can view the rendered source by selecting the entire page (Ctrl+A), right-clicking, and choosing View Selection Source.

If you save the original source and the selection source separately and compare them, you will notice other changes that are related to how Firefox represents the page internally.

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Source views are read-only. If you want to tinker, check out these tools:

DOM Inspector :: Add-ons for Firefox

Web Developer :: Add-ons for Firefox

Firebug :: Add-ons for Firefox

a question to gather information on the "View Page Source" window

To invoke the chrome shortcut from within a bookmark

• javascript:location="view-source:"+location

  suggest using with a keyword shortcut of "source:"

  link: http://kb.mozillazine.org/Chrome_URLs

To change what is used for "View Page Source" to your own editor

• http://dmcritchie.mvps.org/firefox/firefox.htm#notepad

To change formatting above based on file extension:

(no information - but check out the Firefox extensions)

To view what you see in Firefox in another browser, editor, viewer

• https://addons.mozilla.org/en-US/firefox/addon/launchy/
• http://dmcritchie.mvps.org/firefox/firefox.htm#launchy_notes
• http://dmcritchie.mvps.org/firefox/firefox.htm#launchy

Extensions:

• View Source Chart :: Add-ons for Firefox
  https://addons.mozilla.org/en-US/firefox/addon/view-source-chart/

  http://www.techiequest.com/view-source-chart-firefox-add-ons/

MozillaZine:

• http://kb.mozillazine.org/View_source.editor.external
• http://kb.mozillazine.org/View_source.syntax_highlight
• http://kb.mozillazine.org/MediaWiki:Viewsource