1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button and select Settings.

Select the Privacy & Security panel and go to the History section.

1. Make sure Accept cookies from sites is check marked.
2. Make sure Accept third party cookies is check marked.

• • Third-party cookies and Firefox tracking protection can cause problems with some websites. Enable this setting to rule it out as a cause for your problem.

1. Click Exceptions....
2. Make sure the site you're trying to access isn't listed.

• • If it is listed, click on its entry, then click Remove Site.

1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button and select Settings.
2. Click the Privacy icon.
3. Make sure Accept cookies from sites is check marked.
4. Make sure Accept third party cookies is check marked.

• • Third-party cookies and Firefox tracking protection can cause problems with some websites. Enable this setting to rule it out as a cause for your problem.

1. Click Exceptions....
2. 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 windowOn the menu bar, click on the History menu and select Show All History to open the Library window.
2. At the top right corner, type the name of the website you wish to forget in the Search History field, and press EnterReturn.
3. In the resulting list, right-clickhold down the Ctrl key while you click on the site you wish to forget, and select Forget About This Site.
   
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4. Close the Library window.

Clear cookies for that site

The cookies for the site with problems that are already stored on your computer may be causing the problem. Delete them and then test for your problem:

1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button and select Settings.
2. Select the Privacy panel.
3. Click Show Cookies.... The Cookies window will appear.
4. In the Search: field, type the name of the site whose cookies you want to remove. The cookies that match your search will be displayed.
5. Select the cookie(s) in the list to remove and click Remove Cookie.

• • Pressing Ctrlcommand+A will select all the cookies in the list.

1. Click Close to close the Cookies window.
2. Close the Settings page. Any changes you've made will automatically be saved.

1. At the top of the Firefox windowOn the menu bar, click Tools, then 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.
   
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4. Select both Cookies and Cache.
5. Click Clear Now.

1. At the top of the Firefox windowOn the menu bar, click Tools, then select Clear Private Data....
2. Select both Cookies and Cache.
   
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3. Click Clear Private Data Now.