Firefox Community Forum

When trying to access many popular websites with Firefox on my Fedora 43 installation, I am greeted with a security warning page with the SEC_ERROR_UNKNOWN_ISSUER error. For most of these websites I can simply accept and continue, but HSTS-only sites will not permit this.

Affected websites include but are not limited to (based on exceptions in the certificates section of Firefox settings):

• github.io (many subdomains)
• purdue.edu (many subdomains)
• iu.edu
• ebay.com
• cbsnews.com
• iwm.org.uk
• home.cern
• celestrak.org

Any help in resolving this is appreciated.

Yesterday I received non-stop pop ups from <opb-protect.pro> on Firefox, and only Firefox. On going to <Permissions> I checked that I had turned on block pop-ups. It was turned on. But under notifications this sinister pop up had inserted itself as <Allowed>. It has inserted this; <https://d3ka84anaffc73c14rf0.opb-protect.pro>

I had now set that to <Block>. I mention this because this mob have managed to work around the Mozilla pop-up blocker.

Peter JAMES-MARTIN Adelaide, South Australia [email removed]

My bookmarks on my laptop has lost 90% of my bookmarks. I try to sync with my PC but nothing happens and the laptop remains the same. I've tried closing the browser and logout and login again but nothing changes. I've turn of the laptop and turning on still nothing. How can I be log in and see a different layout, it doesn't make any sense. The only thing I have change on this laptop is down loaded a new version of CClean. Which I have already done the day before on my PC. I've attached a copy of both screens 743 is from my PC and the other 534 is from my laptop.

I cannot locate Adobe Acrobat extension to install in Firefox, v143, operating within Windows 11. I had previously been able to install this extension in Firefox operating within Windows 10.

/home/boris/Свалени/Screenshot 2025-10-10 at 11-57-52 (20 ) Family Farm Facebook.png във играта фемили фарм скрула не работи на нито една картина ,която има лента отстрани се налага да я ползвам. при другите браузъри това не е така. в случай че ползвате преводач това е български език.

Here is what the message says: "Firefox is trying to install a new helper tool. Enter your password to allow this" I tried to install but Firefox won't open. Firefox icon just bounces around, I have to force quit to stop it. I DO NOT WANT THIS TOOL BUT I WANT TO USE FIREFOX. By the way this is sent from my other user, as the problem is on my admin. user and I can't open Firefox to do anything!

Have never liked the bright orange Firefox icon, it's too dominating on my desktop, I LOVE the older brownish firefox icon, it's just right. So every time you come out with a Firefox update I get out "Resource Hacker" and change the icon to the older one, pictured below. I mentioned this before, asking if you could just give that option, and didn't receive a response. You come out with so many updates, it's a hassle changing the icon every time, but I'm willing to pay the price to escape the distracting bright orange icon, but now suddenly Firefox won't let me alter the icon in the exe. Was wondering if you'd have any suggestions. Have used Firefox exclusively for decades. Thank you very much.

Tell me how to get rid of this. All of them say via either some numbers and letters, but the company name says zyvennero.co.in. You can click "Dismiss" which does nothing, of course and others just continue to pop up.

I always have two windows of Firefox open, one for each monitor. Up until recently Firefox would always restore both windows exactly as they were before I right clicked the Firefox icon in the taskbar and clicked "close all windows". This week however my browser will only restore one of the two windows I had open, and I have to restore the other one manually which is annoying. Can anyone help me bring back the old behavior so it restores both my windows every time?

How do I change the email account inserted by Firefox when I click on an email link?

I have previously changed the main email address (added secondary address, swapped secondary for primary, deleted secondary) but when I click an email link in a web page to write an email to the web page business, the old deleted email account is used instead of the new one. This old address is not listed at all as far as I have seen in my Mozilla Account.

My bookmarks toolbar is showing, but it's empty. All of my bookmarks are gone.

I went to a websites and attempted to add it to my bookmarks toolbar, but Firefox failed to add it to my toolbar.

Windows 11 Pro on Lenovo ThinkCentre. I switched to ESR a while back, when the regular and ESR versions coincided. All updates since then have worked fine, until now.

When I allow Firefox to update to 140.3.1esr from 128.14.0esr, then the Firefox browser no longer works at all. It comes up, but entering a URL (by typing or bookmark) does nothing and goes nowhere, so I can't use the internet at all.

I had to use Macrium Reflect to restore my system drive to an earlier time to get back on the internet, using version 128.14.0esr, which lost some recent bookmarks, etc. I have tried this twice, with the same result.

Now, a couple of sites no longer work because they say the browser isn't current.

What can I do about this? I hope I don't have to switch to another browser, because there are Firefox extensions I use all the time. However, I can't use a non-updatable browser indefinitely, because more sites won't work.

Can I fix this?

Thanks for your help, AnneF