Firefox Community Forum

Hi!

I am getting messages that I am blocking ads for many of my internet requests. I had never received these before but all of a sudden I started to get them. I have tried a number of things but nothing works.

I am running Windows 11 and do not have any Ad blockers.

Opening PDFs automatically with Firefox and, without any changes I might make, saving them with the download function in Firefox, actually ruins the functionality and data entry function of that file. Specifically this happens with PDF files downloaded from the (not all that amusing) PDFs from the FINCEN, (US Financial Crimes Enforcement Network). I do not see why and how Firefox thinks it is allowed to change files that are simply downloaded and saved on Firefox.

In other words, it seems that Firefox strips away certain "permissions" and/or "functions" (like built-in lookup, menu or choice boxes). This means that the file so downloaded via Firefox can no longer be used to properly fill in data, or to look up and choose data items within the file. (I see many times that ANYTHING having to do with "permissions" tends to be an intractable and unsolvable problem for software makers & experts, so, if you do not know right away how to solve the problem, it will probably take you several years to figure this out.)

The PDF in question is created by a government agency. If you have ever dealt with a government agency, then you know that they act sort of like Adobe or Microsoft: "They don't respond, or they do respond & say they do not understand, and if they understand, they are either unwilling or unable to fix the problem."

If there is a switch or option within Firefox, which lets me tell Firefox "Save this file exactly like it is received, nothing added or removed!", that would be nice. I just have not found such an option yet, and it would be nice if it might get provided someday.

I will share my browser data, but I am sort of convinced that a detailed question like mine will not be addressed within that shared data.

Hello. I am setting up a site on Linux server using Apache as reverse proxy , with ASP.NET as application server . since installing SSL , I had few mixed content blocking that i was managed to fix using CSP directive in Apache configuration file. site has no issue with all browser except Firefox. the only issue is that in admin section , to configure a option. system will load a js file that simply a dropdown with list of options to choose from . when using Firefox , it tries to redirect that page to login page . for test , i clicked on the link i located in Developer tools , which directed me to login page , entered my credentials, and scripts loads showing the drop down box and ok button. is been 3 weeks i been looking for every solution and i have done everything .. but nothing have worked. now I am resort to having to use other browsers if i need to use that functionality in admin page. In page header file name : login , location : http://MYDOMAIN.ca/login?ReturnUrl=%2FAdmin%2FDiscountRulesCustomerRoles%2FConfigure%3FdiscountId%3D6%26_%3D1702682353293 , which are not correct . and browser such as Brave and Safari dose not show different path and file name and everything is correct. dose anyone know how to fix this .. ? i saw a solution mentioned as stated resting Firefox ,but can not find a way to reset , but i have reinstalled Firefox and constantly having this issue on this single section of the page . Thanks.

A few weeks ago I tried installing a Pi-Hole (hardware-based network level ad blocker), removed it shortly thereafter. Since then, I've been getting the "Our systems have detected unusual traffic from your computer network" screen whenever performing a Google search from Firefox in Private mode, either from the toolbar or from the website. It only happens on Firefox (nothing from Chrome incognito windows), only happens in Private windows, and recurs every hour or so within the same open private window.

I've tried everything to reset my system to baseline to root out the issue, but I'm getting nowhere. Things that haven't worked:

• setting all VPN and proxy settings to off
• ensured all DNS settings are set to automatic
• renewing IP (IPv4 and IPv6, via command window and leaving router/modem unplugged overnight and verifying new dynamic IP assigned)
• clearing all browser data (cache, history, cookies)
• disabling all extensions (Ad Block Plus is my only extension)
• refreshing Firefox (about:support > refresh Firefox...)
• hard router reset
• different network device
• multiple malware scans (all clean)

Is there anything specific to Firefox and how it handles Private connections that might be throwing a wrench here? I'm pulling my hair out.

Hi,

I'm using FF (128.8.0esr) on Debian testing.

Is there a way to open a site as window w/o any toolbars/menu etc. , preferably from the command-line, some magic switch?

This thread https://tinyurl.com/24b5q2t2 discusses the "ssb" switch but it's not available in this browser.

Thanks

I had to restore to install last update, May 25, 2025, and turn off auto update, because it is not compatible with GVoice. Or other G anything.

Specifically, it took 20 min. each time with all the stupid verification, for which I needed more verification, and when I did finally access G Voice, I could nor press the lock before the URL, nor any other way to enable Permissions, for sound and mic, which was now all, by default, shut off. I had to use GVoice to reach my SIM provider to find out why I showed plenty of Gigs left on my plan, yet no service for 48 hrs.

The whole verification hassle opens us up to more hacking, not less, as we get desperate, waiting to get the codes in the best of times. Also, phones often do not work, or are too slow to get the code in time. And I always have to do all this in a library parking lot, risking spying, because phone signal/internet rarely reaches us in rural areas, or is corrupted, with greedy AI taking up all the bandwidth. And cable is $50K investment, and does not work when the power is off, which due to Pacific storms, is about a total of 3 months a year. I dread having to go online for anything, and will not update Firefox until I hear some encouraging news.

Thank you all, this is still the best, lightweight browser. And at least I have people here to give me advice!

Unable to connect

Firefox can’t establish a connection to the server at localhost.

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer’s network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the web.

When I try to login to AOL mail, I have to constantly sign in; it doesn't save my password. When I log into Navy Federal Credit union, it doesn't remember the browser for 2-step verification. It used to work.

Sucessfully installed Firefox 139.0.3 armv7 nodpi on an Android 5.1 tablet device, but no matter what website I try to access (even Google), a plain black screen is always displayed. Homepage and Settings page works fine, even those history thumbnails are showing the website correctly. If I click on the address bar to type something, it then suddenly changes from black to the actual website for a blink of a second and then gets black again.

Is there a way to fix this? Firefox Focus, Beta and Nightly behaviors the same. I already tried to uninstall and clearing data/cache. It seems a bug with this specific tablet device I am using even though it shouldn't, since Android 5.1 is still supported, isn't?

Hello, a locally hosted application has a web interface which tries to send a data (POST request) to a remote resource (which is under my control) yet the web browser (Firefox ESR 128.9.0esr) blocks this resource request saying in a developer console (F12) this:

• NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_SECURITY, MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT)

• Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://myRemoteServerIP/request.php. (Reason: CORS request did not succeed). Status code: (null).

I suspect that the CORS blocking is a result of the first (SSL) error, AI also told me that I can configure my remote server/resource (e.g., using Apache, Nginx, or PHP) to include the necessary CORS headers in its responses and indeed the remote server of mine has such lines inside a PHP script that is receiving the request: header('Access-Control-Allow-Origin: *'); header('Access-Control-Allow-Methods: POST'); header('Access-Control-Allow-Headers: *');

The remote resource (server) is using self-signed SSL certificate and it is referenced using IP instead of a domain name.

When I try to do the same request via Private browsing window (without extensions), there is no NS_ERROR about self-signed cert. but only CORS one. When I try browser Librewolf 137.0.2-1 (my FF version is older: 128.9.0), the request is NOT blocked, is OK..

My main aim is not to avoid blocking in my browser, but in all main browsers for everyone.

Is it so that this kind of blocking is default behavior in browsers? Is there please any way to avoid that, beside getting a domain name and CA signed SSL certificate?

view-source:resource://nimbus/lib/RemoteSettingsExperimentLoader.sys.mjs

This is making multiple "WARNING"s to appear. I believe that it is causing my DELL to shut down arbitrarily. How do I delete this ?