I get error code: SSL_ERROR_RX_RECORD_TOO_LONG for gmail . It does not happen on another browser.
Secure Connection Failed
An error occurred during a connection to gmail.com. SSL received a record that exceeded the maximum permissible length. Error code: SSL_ERROR_RX_RECORD_TOO_LONG
The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem.
Solution choisie
What security software do you have?
It is possible that your security software has a problem with TLS 1.3 that might have been enabled in your Firefox version. You can try to modify the value this pref from 4 to 3 on the about:config page.
- security.tls.version.max = 3
You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.
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Separate Issue; Your System Details shows;
Installed Plug-ins
Shockwave Flash 29.0 r0
Shockwave Flash 30.0 r0
Having more than one version of a program may cause issues.
You must remove the older programs. Then get the current full installer.
Flash: Grab the uninstaller from here:
http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows
http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac
Then reinstall the latest version.
Note: Windows users should download the active_x for Internet Explorer. and the plugin for Plugin-based browsers (like Firefox).
Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the active_x.
Flash Player Version 30.0.0.113
https://get.adobe.com/flashplayer/ Direct link scans current system and browser Note: Other software is offered in the download. <Windows Only>
https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, Win IE . . . .) Note: Other software is offered in the download. <Windows Only>
See if there are updates for your graphics drivers https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration
There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate.
https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites
https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message
https://support.mozilla.org/en-US/kb/connection-untrusted-error-message
http://kb.mozillazine.org/Error_loading_websites
‘ssl_error_rx_record_too_long’ or ‘cannot display the webpage’
Internet search; More often than not, you have something misconfigured!
Solution choisie
What security software do you have?
It is possible that your security software has a problem with TLS 1.3 that might have been enabled in your Firefox version. You can try to modify the value this pref from 4 to 3 on the about:config page.
- security.tls.version.max = 3
You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.
It also happened to my Firefox. I did a refresh and then tried opening it. It didn't work for the first time but the second time it worked. Looks like it was just a faulty setting.
Hello,
The Refresh feature (called "Reset" in older Firefox versions) can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.
Note: When you use this feature, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information.
To Refresh Firefox:
- Open the Troubleshooting Information page using one of these methods:
- Click the menu button
, click help 
and select Troubleshooting Information. A new tab containing your troubleshooting information should open.
- If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page.
- Click the menu button
- At the top right corner of the page, you should see a button that says "Refresh Firefox" ("Reset Firefox" in older Firefox versions). Click on it.
- Firefox will close. After the refresh process is completed, Firefox will show a window with the information that is imported.
- Click Finish and Firefox will reopen.
Did this fix the problem? Please report back to us!
Thank you.
An update to Firefox was just released which can cause the Secure Connection Failed error. This is from the Firefox 61 release notes:
Users with Avast or AVG security software using the HTTPS Scanning feature may get an error message (SSL_ERROR_RX_RECORD_TOO_LONG) when trying to access secure sites. Workarounds are available from this support article until fixed versions of Avast and AVG are available.
The support article link goes to a section of the Secure connection failed and Firefox did not connect article, which explains how to turn off HTTPS scanning in the Web Shield component of Avast/AVG. For more information, see Managing HTTPS scanning in Web Shield in Avast Antivirus on the Avast support site.