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Obviously, I want to get the answer without saving the page. It seems basic, but I can't figure out how to do that. If it requires a plugin, it's ok. It would be nice if the solution would also cover styling sheets, scripts and images, associated with the page.

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up vote 20 down vote accepted

Open Developer tools (Ctrl+Shift+I or Settings Icon at the top-right of your browser window => Tools => Developer tools) on the needed page, switch to the Network tab and reload page.

In the Size column you'll see the size of everything loaded (Documents, Stylesheets, Images, Scripts, ...). You can enable filter to help you find out only needed stuff at the bottom-center of Developer tools frame.

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Thanks! The need to reload is not so intuitive. – xxzoid Dec 6 '11 at 14:04
Kind of sucks. Right click -> 'view properties' or something similar on an already loaded page would feel much more intuitive. – tholu Oct 15 '14 at 16:43
Its worth adding that the total size of all requests to the server is listed at the very very bottom when you have the Network tab open. It's not immediately obvious – Aidan Miles Apr 14 '15 at 17:53

There's an extension called "Quick source viewer", which caches all the resources when a page is loaded. Open the viewer (blue icon), the size (number of bytes) is shown in the navigation pane on the left.

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