How to Set Firefox's Cache to Zero
1 Via Firefox Options
2 Click the Tools'' menu
Click the "Tools" menu, and then select "Options." If you're using OS X, launch the settings utility by clicking the "Application" menu, and then selecting "Preferences." On Linux, click "Edit," and then select "Preferences."
3 Click the Advanced'' button
Click the "Advanced" button, and then select the "Network" tab.
4 Check the box
Check the box labeled "Override automatic cache management.”
5 Click the down arrow
Click the down arrow on the "Limit cache to" spin box to highlight the current cache size, and then type "0" (without the quotes). The cache still contains your old data at this point, so click the "Clear Now" button to clear the cache completely.
6 Click to save your new cache setting
Click "OK" to save your new cache setting.
7 Via About:Config
8 Type about : config''
Type "about:config" (without the quotes) in the browser's address bar, and then press "Enter" to load your Firefox configuration settings. If Firefox displays the warning "This might void your warranty!", click the "I'll be careful, I promise!" button.
9 Type browser.cache.disk.capacity''
Type "browser.cache.disk.capacity" (without the quotes) in the search box to filter all settings except the one for cache size. This eliminates the possibility of changing the wrong setting by mistake.
10 Double-click the search result
Double-click the search result, type "0" (without the quotes) in the pop-up input box, and then click "OK."
11 Close the about
Close the about:config tab when you are done.
- Information in this article applied Firefox 27.0. It may vary slightly or significantly with other versions of Firefox.