Firefox Community Forum

Several of my financial accounts give me this error with Firefox. I had to go to Edge to get my tax documents. I'd much rather have a way to get to my sites without leaving Firefox.

HSTS required

Other websites may require HTTP Strict Transport Security (HSTS) and will not allow access with an insecure connection.

Hello, i am wondering about the blocking of extensions on "Quarantined Domains".

Is there a list of them available to explore? Who maintains this list? Can some fishy website admin add his domain to it to block some 3rd party security addons? How can i whitelist a fishy extension on only 1 blocked site without losing the protection?

The faq articles are not really helpful for this.

Since the new updates the shortcut to add a new tab is gone - how do I get that back. Also i can no longer download my videos from facebook to upload to youtube - can that be fixed as well?

In previous versions of Firefox (up to version 133), it was possible to automatically trigger printing of a PDF file by loading it into an iframe from a sandboxed iframe and call print. However, starting with version 134, this no longer works.

Is there any other way to automatically trigger the print dialog for a PDF file in Firefox, similar to how it can be done in Chrome/Edge (e.g., by opening the PDF in a new window and directly triggering the print dialog without additional button clicks)?

Hi, During some tests I found that FF 115.19.0esr can still execute arbitrary JS similarly to CVE-2024-4367. I’ve checked the versions and > 115.11esr should be patched. Any payload with ‘/JS’ taken from https://github.com/luigigubello/PayloadsAllThePDFs/tree/main will do. Since this is probably important – FontMatrix is *not* working (no JS), original PoC (https://codeanlabs.com/wp-content/uploads/2024/05/poc_generalized_CVE-2024-4367.pdf) is also *not* working. I also wasn’t able to call an external script and so far haven’t found any path to exploit it beyond an alertbox. However, it still bothers me a lot and I’d like to know whether it’s the correct, expected behavior with FF+pdf.js, is it a vulnerability, or maybe my browser was somehow corrupted or is using some other mechanism that’s not within your control (my settings? about:config?).

Steps to re-create: 1. Open file in notepad 2. Add ‘/OpenAction 99 0 R’ after ‘lang’ in ‘1 0 obj section’ 3. After ‘endobj’ add ‘99 0 obj <</Type /Action /S /JavaScript /JS (app.alert\(1\);)>>’ 4. Result – alertbox popping twice

I got a popup from firefox saying "allow firefox to share with devices on my local networks?" I said yes but now realize Im not sure what i agreed to. What is this specifically? How do i turn this off again? Thanks

I SUBSCRIBE TO TOTAL AD BLOCK BUT I ONLY USE FIREFOX AND DO NOT SEE HOW TO DOWNLOAD THE APP.

PLEASE ADVISE THANK YOU DAVID VOSBEIN [edited phone# from community forum]

I have a 2023 MacBook Pro and a Synology NAS. Fairly recently, when I have tried to access the web site for the NAS using Firefox, I have received the following error message: "Unable to connect. An error occurred during a connection to [the IP address].” I am able to access the web site using the Safari and Bing browsers, and I also am able to access the web site using Firefox on an iPad. I already have contacted Apple and Synology support personnel, and have been that the issue is not with either Apple or Synology products. Please let me of any potential solutions to this problem that Mozilla may have.