This article explains how to fix problems with websites that display incorrectly in Firefox or don't work the way they should.

Clear the cookies and cache

Firefox caches websites, which means it saves some files on your machine so that it doesn't have to re-download everything when you visit sites. If a website has updated their code, Firefox may still be using some of the old code along with some of the new, which can make a web page display incorrectly. To fix this, you need to clear the cookies and cache:

1. Click the menu button to open the menu panel.
2. Click History and select Clear Recent History…
3. In the Time Range to clear: drop-down, select Everything.
4. Below the drop-down menu, select both Cookies and Cache. Make sure other items you want to keep are not selected.
5. Click OK.

Reset Zoom

Some websites may not look right at different zoom levels. To reset Zoom setting, for the site, press Ctrl + 0command + 0 and for all sites, see the documentation about the Zoom add-on you use.

Reset the minimum font size

Some sites do not display properly with a minimum font size. To reset the minimum font size:

1. In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select Settings.
2. Select the General panel and navigate to Language and Appearance.
3. In the Fonts & Colors section, click Advanced….
4. Change the Minimum font size to None.

Reset the page style

You may have inadvertently set the page style to No Style. To ensure Firefox is set to use the page's default style:

• Press the Alt key (or the AltGr key) to temporarily bring up the Firefox Menu barOn the menu bar at the top of the Firefox window, click on the View menu, then select Page Style and click Basic Page Style.

Now that the page is using its default style, it may be displayed correctly.

Check that JavaScript is not blocked

You should check whether you have an extension (such as NoScript) or Internet security program (such as a firewall, antivirus, or anti-spyware program) that can block JavaScript. To learn more, see JavaScript settings and preferences for interactive web pages.

Check that your system clock is set correctly

In some instances the loading and verification of secure web content will be time-dependent, so you should check that date, time and timezone are set correctly on your system.

Disable problematic extensions or hardware acceleration

Some extensions may interfere with the way websites are displayed, or your graphics card and drivers don't display some web content correctly when hardware acceleration is turned on. Follow the instructions in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to see if one of these is causing the problem.

Check if Firefox has blocked insecure content

Firefox blocks potentially harmful, insecure content on web pages that are supposed to be secure. Click the padlock icon in the address bar to see if Firefox has blocked insecure parts of the page. See Mixed content blocking in Firefox for details.

Turn off Enhanced Tracking Protection for the website

Sometimes Enhanced Tracking Protection can cause site breakage when tracking content is blocked. To disable tracking protection for the website:

1. Click the shield in the address bar to open the Protections panel.
2. Click the blue toggle switch. The page will reload with Enhanced Tracking Protection turned off.

This will allow trackers to load on that site only. Trackers will continue to be blocked on other sites.

Report the website

If turning off Enhanced Tracking Protection allows a page to display and work correctly, you can report the website to help improve Firefox. See the Report breakage due to blocking article for more information.

Occasionally, you may come across a page that simply doesn't work in Firefox, even when Enhanced Tracking Protection is turned off. If the same page works in another browser, please report the problem by visiting Webcompat.com.

Related links

• Websites don't load - troubleshoot and fix error messages
• Fix problems that cause images to not show
• Fix common audio and video issues

Based on information from Websites look wrong (mozillaZine KB)