If you have an antivirus or Internet security program, update its detections database and do a full scan of your system.Certain types of malware are known to target Firefox and can prevent it from loading various websites: If clearing the cookies and cache didn't help, you should check your computer for malware. Make sure other items you want to keep are not selected. Below the drop-down menu, select both Cookies and Cache.
In the Time Range to clear: drop-down, select Everything. Click History and select Clear Recent History…. Click the menu button to open the menu panel. If you find that Firefox can load some websites but not others, first clear your Firefox cookies and cache: Click the Toggle button to set the preference value to true, if it's not already set. If such preference doesn't already exist, select Boolean and click the Add button. Click Accept the Risk and Continue to go to the about:config page. Type about:config in the address bar and press Enter Return.Ī warning page may appear. This is recommended for advanced users only. Warning: Changing advanced preferences can affect Firefox's stability and security. Any changes you've made will automatically be saved. If you connect to the Internet through a proxy, compare Firefox's settings to another browser's (which is working normally). If you don't connect to the Internet through a proxy (or don't know whether you connect through a proxy), select No Proxy. In the Network Settings section click Settings…. In the General panel scroll down to the Network Settings section. Click the menu button and select Settings. In the Menu bar at the top of the screen, click Firefox and select Preferences. 
To check your connection settings in Firefox: If you connect to the Internet through a proxy server that is having connection problems, you will not be able to load websites. For instructions on how to configure some programs, see Configure firewalls so that Firefox can access the Internet. So, you should make sure your Internet security software is up-to-date and remove Firefox from your program's list of trusted or recognized programs, then add it back. Note: Some Internet security programs can block Internet access even when they are disabled.
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