This article describes how to troubleshoot problems that involve websites reporting that cookies are blocked or disabled. For more information on cookies, see the Cookies article.

Check cookie settings

Firefox can be set to not accept cookies. To turn on cookies:

1. At the top of the Firefox window, click on the Firefox button (Tools menu in Windows XP) and then click OptionsOn the menu bar, click on the Firefox menu and select Preferences...At the top of the Firefox window, click on the Edit menu and select PreferencesAt the top of the Firefox window, click on the Tools menu and select Options...On the menu bar, click on the Firefox menu and select Preferences...At the top of the Firefox window, click on the Edit menu and select Preferences...

2. Select the Privacy panel.

3. Set Firefox will: to Use custom settings for history.
   
   
   
4. Make sure Accept cookies from sites is check marked.
5. Make sure Accept third party cookies is check marked.
   • Disabling third party cookies can cause problems with some websites. Enable this setting to rule it out as a cause for your problem.
6. Click Exceptions....
7. Make sure the site you're trying to access isn't listed.
   • If it is listed, click on its entry, then click Remove Site.

Clear history for that site

The cookies and temporary data already stored on your computer may be causing the problem. Delete them, then test for your problem:

1. At the top of the Firefox window, click the Firefox button, go over to the History menu (For Windows XP: click the History menu) and select Show All History to open the Library window.On the menu bar, click the History menu and select Show All History to open the Library window.At the top of the Firefox window, click the History menu and select Show All History to open the Library window.

   At the top of the Firefox window, click the History menu and select Show All History to open the Library window.On the menu bar, click the History menu and select Show All History to open the Library window.

2. Search for the website you want to remove from your history by typing its name in the Search History field in the top-right corner and then pressing EnterReturn.
3. Then, in the search results, right-clickhold down the Ctrl key while you click on the site you want to remove, and select Forget About This Site.
   All history items (browsing and download history, cookies, cache, active logins, passwords, saved form data, exceptions for cookies, images, pop-ups) for that site will be removed.
   
   
4. Finally, close the Library window.

Clear all cookies and the cache

If deleting cookies for the site with the problem did not fix the error, clear all the cookies stored on your computer and clear the Firefox cache:

1. At the top of the Firefox window, click on the Firefox button, go over to the History menu and select Clear Recent History....
   For Windows XP: At the top of the Firefox window, click on the Tools menu and select Clear Recent History....On the menu bar, click on the Tools menu, and select Clear Recent History....At the top of the Firefox window, click on the Tools menu, and select Clear Recent History....At the top of the Firefox window, click on the Tools menu, and select Clear Recent History....On the menu bar, click on the Tools menu, and select Clear Recent History....
2. In the Time Range to clear: drop-down, select Everything.
3. Click the arrow next to Details to display the list of items that can be cleared.
4. Select both Cookies and Cache.
5. Click Clear Now.

Based on information from Websites report cookies are disabled (mozillaZine KB)