Contents of the page in firefox after restarting

In my firefox open some tabs. After restarting, tabs re-loaded from the network. How to make their content is loaded from the cache, as in the Opera?

Look for the Work Offline in the File menu. If you have the orange Firefox menu button then you can use Firefox > Web Developer > Work Offline

You can find the location of the disk cache on the about:cache page.

In case you are using "Clear history when Firefox closes":

do not clear the Cache because Firefox will disable the disk cache in such a case 

Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
https://support.mozilla.org/kb/Clear+Recent+History 

Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.

The offline (application) cache is used by other applications to store data and serves a different purpose.

https://developer.mozilla.org/en-US/docs/IndexedDB
https://developer.mozilla.org/en-US/docs/HTML/Using_the_application_cache

Modified June 15, 2013 2:35:29 PM PDT by cor-e

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note this is assuming you are in FF21 or newer l