All Products Support Forum

How can I resolve the issue of my website not displaying properly on Mozilla Firefox browser, specifically with regards to the layout and formatting? Are there any specific CSS or HTML codes that need to be modified to ensure compatibility with Firefox, and are there any known compatibility issues between Firefox and certain web development frameworks or libraries that I should be aware of?

Can't connect with the just downloaded version 66.0.4 to virtually any site - not to Google, not to NYT, not even to Mozilla - Firefox won't accept ANY certificate! Following errors appear (examples): "Did Not Connect: Potential Security Issue Firefox detected a potential security threat and did not continue to addons.cdn.mozilla.net because this web site requires a secure connection. What can you do about it? addons.cdn.mozilla.net has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site. The issue is most likely with the web site, and there is nothing you can do to resolve it. If you are on a corporate network or using anti-virus software, you can reach out to the support teams for assistance. You can also notify the web site’s administrator about the problem.

Or: Warning: Potential Security Risk Ahead Firefox detected a potential security threat and did not continue to www.nytimes.com. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details. What can you do about it? The issue is most likely with the web site, and there is nothing you can do to resolve it. If you are on a corporate network or using anti-virus software, you can reach out to the support teams for assistance. You can also notify the web site’s administrator about the problem.

The explanation is as follows: Someone could be trying to impersonate the site and you should not continue. Web sites prove their identity via certificates. Firefox does not trust www.nytimes.com because its certificate issuer is unknown, the certificate is self-signed, or the server is not sending the correct intermediate certificates. Error code: SEC_ERROR_UNKNOWN_ISSUER

No problems whatever with other browsers. I'm sending this with Safari.

Everyone going to the above mentioned website experiences the same annoying reloads. Please add a method to Firefox like IE has that can restrict sites reloading, assuming this doesn't exist already. Thanks

Hello! Recently I've got a new phone with a 1080 x 2400 resolution (20:9), aaand Firefox browser doesn't work well on Youtube when it comes to fullscreen watching. The bottom part of any video is cut off (like you can see on the attached pictures). Is there a way to solve it?

Both android 10 and the browser are updated.

I am getting a certification issue when trying to visit 2 specific sites which are some of the most visited sites in the web: https://www.google.com and https://www.youtube.com

The error it shows when trying to visit these 2 pages, is SEC_ERROR_UNKNOWN_ISSUER.

I have tried to troubleshoot it and follow the solutions recommended at: https://support.mozilla.org/en-US/kb/error-codes-secure-websites#w_the-error-occurs-on-multiple-secure-sites

however none of the solutions described in this guide worked to solve my problem.

In that guide, one of the suggested solutions is to scan my system for any malware. I used the following: Windows Defender Maleware Bytes AntiMalware Karpersky TDSSkiller however the results are all clean.

In the guide, it suggested that I check the clock as well. The system clock however is synchronized.

Last, I have resetted Firefox Profile but this didnt fix the issue either.

I shall note that the issue appeared yesterday and so far nothing helped fixing it. Not even the system restarts.

The issue about visiting these two sites, is limited only to Firefox.

I can access https://www.google.com and https://www.youtube.com without problems using Google Chrome and the Opera Browser.

Also, Google Mail and Google Translate work fine on Firefox. These two sites can be accessed with Firefox without causing any SEC_ERROR_UNKNOWN_ISSUER errors.

The answers I found on the internet re firefox prevented this page from automatically redirecting do not apply to my version of Firefox . There is no ADVANCED under Options/General.

When I get firefox prevented this page from automatically redirecting, the ALLOW often does not work.

How can I get rid of this feature?

Since the last (?) update, sometime in the spring months this year, Firefox has not been able to display website fonts correctly. Often times part of the fonts turn to question marks, and the problem just turned even worse: even sites that I use regulary turned to complete mess – ALL TEXT. What the hell is wrong?

And NO, preference settings have no effect whatsoever.

again the shopping cart in aliexpress does not work. there are no addons. in pinterest, and after a while, the computer hangs up.

опять корзина в алиэкспресс не работает. никаких дополнений нет. в pinterest и вовсе через некоторое время намертво вешает комп.

I am continuing to have issues going to this web site. www.goldtonemusicgroup.com/goldtone. Works great on chrome but firefox fails miserably. The page needs to be downsized and when you click on a link it may open it but it may be behind it but I am never able to get to it. I think possibly the last update something must have messed up. I used to be able to load it but not anymore. I have to use another browser to work with this web site. Other web sites seem to be ok. Thanks for any info.

Attached is a sample of how web pages display. These can either initially display this way or, as in this example, the page opened correctly, I stepped away for a few minutes and when I viewed the page again it looked like the example. I can have a page open and it is displaying correctly, then open a new tab and go to a different site and the text will look like the example.

I have cleared the cache, dumped all the cookies. Restarting the browser (I do this many times a day) will fix the current page but eventually another page will display like this.

I running version 84.0.2 64bit on a Mac Pro Mojave. I don't have this problem with other browsers like Chrome or Safari. I never see it on my Windows 10 system.

For the first time after 10 years, I can no longer access my PNC bank account using Firefox V84.0.2. This problem started just this Sunday Jan 24, 2021. I am using AVG and the Defender firewall. When I try to enter my account PNC tells me that it cannot find the code and tells me to use another browser like Chrome or Internet Explorer which I don't want to do. PNC tell me to contact Firefox as, "It is not their problem." But so far I have found nothing in Firefox to solve the issue whatever is causing it. I need help as I would rather not change browsers.

I have restarted my PC, checked and restarted AVG, checked the troubleshooting program, and reinstalled Firefox, but nothing seems to correct the problem. So where do I go from here?

Firefox browser not allowing me to log into my Yahoo email account, system returning password error #201. I'm able to Login to account using Microsoft Edge browser.

I'm using Firefox 85. Windows 10. Started happening 2 days ago.

I've come across some sites that are giving me errors, but they work fine in chrome.

Things I've tried:

• Restarting computer
• Restarting router
• Disabling Firefox addons
• Clearing all cookies + history
• Clearing cache

Below is what happens when I try to sign into the Playstation Store. Also getting similar 406 error trying to access Yamazaki Home

Example: When I click "SIGN IN" on the Playstation Store page, I'm met with a 406 error.

These are the headers that are returned.

Response Headers. Cache-Control no-cache, no-store, max-age=0, must-revalidate Connection keep-alive Content-Length 38 Content-Type application/json;charset=UTF-8 Date Sat, 30 Jan 2021 20:01:40 GMT Expires 0 Server nginx Strict-Transport-Security max-age=31536000 ; includeSubDomains X-Content-Type-Options nosniff, nosniff X-CorrelationId c22fffff-05c7-4d2c-81c0-699bbba555c3 X-Frame-Options DENY X-Psn-Correlation-Id c22fffff-05c7-4d2c-81c0-699bbba555c3 X-Psn-Request-Id 8b5177d1681a03522a5a687f9de05f18 X-RequestId 8b5177d1681a03522a5a687f9de05f18 X-XSS-Protection 1; mode=block

Request Headers Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/\*;q=0.8 Accept-Encoding gzip, deflate, br Accept-Language en-US,en;q=0.5 Connection keep-alive DNT 1 Host ca.account.sony.com Referer https://store.playstation.com/en-us/latest Upgrade-Insecure-Requests 1 User-Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0

When printing PDF document from web site using Firefox part of the left text is cut off. I have tried "Fit to Page" and shrink to 90% and still have issue. I can print this web document with Edge with no problem. This problem just started in the last several days. I am using Win 10 professional on a Del Opti-Plex 5080.