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How can I stop being prevented from accessing a web site?

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I needed to ask a question at Disability.gov and the Firefox browser stopped me. Why? And, how do I stop this from happening in the future.

I needed to ask a question at Disability.gov and the Firefox browser stopped me. Why? And, how do I stop this from happening in the future.
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As a test, try temporarily disabling your security software (anti-virus, firewall, VPN, etc). Some security programs that include TLS or HTTP filtering/scanning can cause this type of issue.

If the problem goes away with your security software disabled, you will need to change the program's settings to disable that feature. Instructions for that will vary depending on the program that you are using.

Hope this helps.

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It is working properly here, so it looks that this is an issue on your side.

If the above didn't work:

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Remove the Cookies" for websites that cause problems:

  • Options/Preferences -> Privacy & Security
    Cookies and Site Data -> Manage Data

"Clear the Cache":

  • Options/Preferences -> Privacy & Security
    Cookies and Site Data -> Clear Data -> Cached Web Content: Clear

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox from this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data from that website will be saved once again.