How to Clear Startup Cache in Mozilla Firefox



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Firefox’s cache temporarily stores images, scripts and other parts of the websites you visit to speed up browsing. This article describes how to clear the cache.

It is not necessary to clear the cache in Firefox every day, but it can solve or prevent problems. The Firefox cache contains locally stored copies of websites you have recently visited. So the next time you visit a page, Firefox will load it from the saved copy, which is faster than downloading it from the Internet again. If the cache is not refreshed when Firefox detects a change to the website, or if the files stored in the cache are corrupted, it can cause web pages to look and behave strangely.

To help Firefox users troubleshoot browser issues more easily, Mozilla has added a new “Clear Startup Cache” button on the support settings page. Previously, some users could not successfully start a Firefox browser by clicking a shortcut on the desktop or taskbar, but you can see in the task manager that a Firefox process consumes system resources.

According to normal logic, if Firefox doesn’t open smoothly, it should at least display an error message to see what the problem is that caused the error.

To Clear the Startup Cache in Mozilla Firefox

  • Open the Firefox browser.
  • Type about:support in the browser address bar or click Help > Troubleshooting Information on the menu.
  • Click the “Clear Startup Cache” button on the right side.
  • In the next dialog box, click the “Restart” button to confirm the operation.
  • The browser will restart. It will rebuild its boot cache.


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This handy option is also new in Nightly. If your version of Firefox does not include the above button on the troubleshooting information page, or if you can’t access this page, try the following.

How to Manually Clear the Startup Cache in Mozilla Firefox

  • Close all Firefox windows if you have one open.
  • Open the file explorer.
  • Copy and paste the following into the address bar: %userprofile%\AppData\Local\Mozilla\Firefox\Profiles.
  • For each profile folder you see, delete the startupCache subfolder.

https://support.mozilla.org/en-US/questions/1022218



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