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(1) "Document Header Information". Using this gives a summary of some of the page properties (but different from the properties reported by, for example, Ctrl+I in Mozilla). As well as modification date, It seems to actually query the server. As an example, webmasterworld returns
"Apache/1.3.26 (Unix) FrontPage/5.0.2.2510"
To my knowledge, there is no other straightforward way to obtain this information... I'd love to be proved wrong.
(2) "Pixel Color". As expected, this launches a popup with the RGB hex codes for the point where you clicked... Very useful for webmasters, but I've not seen any new browser with this! Maybe it's there and I missed it?
So assuming I haven't missed anything in Moz/Konq/Opera, is there any browser that has any of these features?
This will give you two things:
1) an extra pane in [ctrl]i with the server header information for the page
2) a window under 'menu:Tools->Web Development->Live HTTP Headers' that will record an entire session - both what Mozilla sends to the server and the server response
I'm finding this tool to be indispensable when debugging pages - especially when you are sending form data to the server or checking for the correct mime types
"X-Powered-By: BestBBS v3.15"
and some cache stuff as well... Pretty interesting.