By Hally | Last Updated
Fail to access one or more websites in your Firefox browser because of the Sec_Error_Bad_Signature Error? Instead of uninstalling and giving up Firefox, you can try the 5 ways here to fix the Sec_Error_Bad_Signature Error in Firefox.
Restarting the computer is the simplest way and works most of the time. After restarting your computer, you can relaunch Firefox to see whether the issue is fixed.
Step 1: In the upper menu bar of Firefox interface, click the Library button > History > Clear Recent History.
Step 2: Choose Everything for the Time Range to clear option and Tick Cookies & Cache under History. Then, click the Clear Now button to execute the operation.
If your computer can connect to the Internet without a proxy, you can turn off it in Firefox.
Step 1: Run Firefox and click the Menu
button.
Step 2: Select General in the left pane, locate to the Network Settings option and click Settings.
Step 3: Choose No proxy and click OK to save the change.
Step 4: Relaunch Firefox.
Antivirus can also cause the Firefox error. If there is the antivirus installed in your computer, you need to check if Firefox is detected as the untruth software by it, if it is, remove Firefox from the list. Or you can disable the internet security option in the antivirus. When the two settings above don't take effect, you can disable the entire antivirus directly to check if the blocked websites are accessible in Firefox again.
To reinstall Firefox conveniently, you can prepare the Firefox installer before you uninstall it. And to uninstall Firefox completely, it's suggested to delete the Firefox program folder manually after uninstalling Firefox in Control Panel, just go to the folder where you save and install Firefox and remove it. If you aren't sure the installation location of Firefox, you can right-click the Firefox icon and choose Shortcut in Properties to have a check.
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