Firefox Support Forum

Did Not Connect: Potential Security Issue

Firefox detected a potential security threat and did not continue to www.google.com because this website requires a secure connection.

What can you do about it?

www.google.com 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 website, 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 website’s administrator about the problem.

When clicking advanced button there is no way to proceed:

Someone could be trying to impersonate the site and you should not continue.

Websites prove their identity via certificates. Firefox does not trust www.google.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

View Certificate

When I click a link on a website, a new Firefox tab opens with this message: 400 Bad Request Request Header Or Cookie Too Large nginx/1.18.0 (Ubuntu). This is new behavior; it was working fine until yesterday. Can you tell me how to fix it?

I want to resize a window, without dragging the edges around. I've read the resizing instructions and am unable to find the "resize" icon next to the address bar. any help would be greatly appreciated.

Firefox was working fine yesterday. But all of a sudden while playing a youtube video it started being choppy. It drops frames, scrolling and video playback are choppy and laggy, there is lag on button inputs, the system is choppy and laggy too while firefox is open, especially when video is playing. I checked the CPU and GPU usage and I can't see any spikes. I have tried refreshing firefox but that did not fix the problem.

OS is manjaro linux (gnome version) latest. Firefox is also at the latest version.

How do I block autoplay vedio?

I know I can block Audio and Video, but I just want to block autoplay video. As if I use the block audio and video it will mute all videos I open, and I need to unmute it every time. I just want autoplay to not start, not mute the video too.

I used the same account with two computers. I always keep my account in sync. Actually, they do not. My previous notebook has a series of bookmarks, but the bookmarks in the latter one is exactly different. It seems like two accounts, but I log in with the same account. Miracly, when I log the same account with my phone, the bookmarks in my phone is sync with my previous notebook I don't know how to solve it and appreciate your answer.

我有两台笔记本，登录同一个账户时是不同步的。两个笔记本的书签页完全各顾各，但我登录的是一个账户且一直保持着同步。当我用手机登录同一个账户的时候，手机会有第一个笔记本同步；第二个笔记本就好像完全是新的账户。 我不知道怎么解决这个问题，希望专业的你的回复。

Is it possible to restore previously deleted pages in FF history? There are instructions for FF in Windows but I am using Ubuntu 16.04 esm and the FF version is 102.10.0esr.

The pages were deleted  several days ago and the computer has been shut down and rebooted many times since then.

If it is possible doesn't that defeat the object of deleting history pages?

Hope someone has an idea! Derek

Starting about 2 weeks ago everytime I access Facebook, it starts reloading pages and I can't stop it. This is the only site I've had the problem with and it always starts happening when I have paged down several pages. I've tried changing settings, and even uninstalled the system and re-installed to no avail. Something has changed so please fix it!

Hi,

I recently created a new profile in Firefox as I regularly do, as a consequence I found that the "Page Setup" menu option has been removed in a past release.

I can't fathom why this has been removed, I "print" plenty of PDF's and like to customise the Headers/Footers based on what I'm "printing".

Searching for a fix suggests either installing a 3rd Party Add-on or "hacking" the "about:config". This is not user friendly in the slightest for something that has been around for literal decades.

Forcing a user to install an Add-on or even go through "about:config" and set "print.show_page_setup_menu" to true is bonkers!

Yes, bonkers!

Please restore the "Page Setup" option as default, please don't remove it or stealth hide it.

Sincerely,

Jay

I no longer see a box that contains a variety of search engine choices. I have been using DuckDuckGo and am very dissatisfied with it now. I'd love to know which one(s) people recommend (not google, bing etc, please!) and what the steps are now to changing DDG as my default to this new one? Many thanks (I'm a senior and quite computer literate unless the reply contains tech language I might not understand...)

I tried importing passwords from Chrome, but the Chrome browser on this machine doesn't actually contain any passwords. Do I need to sync the two on another machine, or is it possible to import from Google Password Manager instead of Chrome?

Hi there!

I have the issue that when I enter a website that is in English, I sometimes get a little Google translator pop-up at the top which asks me to translate the page. As I am fully fluent in English, I would like to disable this but the option "Disable for English" does not seem to do anything, as this keeps happening. I can disable it for an individual website but I would like to disable it completely.

I'm also confused because within Firefox I have only selected US English as a preferred language. My laptop itself is set to German.

I don't have any translator add-ons installed and can't figure out where this pop-up even comes from, let alone how to fully disable it.

If anyone could help, I'd be very grateful!

Anne