Firefox Community Forum

I keep getting this message:

Firefox Can’t Open This Page

To protect your security, login.microsoftonline.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window. What can you do about it?

To protect your security, login.microsoftonline.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window.

I can't open the link in a new window as I have to click on a tab and when I right click on the tab it only gives the pop up box that says "take a screen shot" etc.

I tried "allowing" the website for pop-ups but it still didn't work. I don't know what to do now.

Firefox just updated, now getting ACCESS DENIED at common sites, Home Depot, JC Penney, American Airlines, United Airlines and I don't know how many more.

How do I fix this or go back to previous versions of Firefox?

Or just move to Google?

I got to PIA's website, i navigate to the download vpn section and from there, firefox blocks the connection and says the server is offline, Ive just done this chrome and edge with no issue, my issue is that its not only this site itll do this on.

After update, I am denied access to my Xfinity email account: You don't have permission to access "http://login.xfinity.com/login" on this server.

websites are being blocked when I click on links from my email account and I don't know why but I also want it stopped the websites are Stage32.com and https://course.fp-platform.online/learn/hRpTYcFi2UyZKzLm2gaOHg/theory

I have been placing a weekly online shop with Sainsbury for 10yrs+, on checkout their is redirect to my bank for authorisation of the amount. This hasn't worked since yesterday and after my third attempt today I noticed there was a message at top of page saying Firefox was blocking this redirect?? I haven't changed any settings recently so why is this suddenly happening?

I am a business owner and I need to log into united health care provider portal. Mozilla will not allow me to access. I'm using this link: https://secure.uhcprovider.com/ and Mozilla will not allow me to go further. This is causing work stoppage. Chat GPT says the link is secure. HELP! I need access so I can get paid.

From Chat GTP:

https://secure.uhcprovider.com/ I checked that exact URL, and here’s the key point:

👉 secure.uhcprovider.com is actually configured with HTTPS and a valid SSL certificate—so under normal conditions, your browser should show it as secure.

So if your browser is blocking it or labeling it “not secure,” the problem is almost certainly local (your device/network) rather than a new issue with UHC.

I am unable to load my Facebook . have Googled the problem but am anable to perform most of their advice. I am running W11 and have emptied the cache but this didn't fix the problem. Please help !!

Firefox now blocks my email account... https://my.netzero.net/start/login.do I can log in through Microsoft Edge, however Firefox no longer allows this.

How do I stop this from happening; never had this much of a problem before.

Access Denied You don't have permission to access "http://www.overstock.com/O-Days-Extra-20-Sale,/link,/results.html?" on this server.

Firefox recently updated on my Windows 11 desktop. As of yesterday (4/24/2026) and possibly earlier after typing www.facebook.com in the URL input space and hitting enter, no results at all.

why did this error occur, wven tho https - only mode was disabled. and i wsa not not able to login the mathworks.com reset password webpage, i wsa able to sign in. this did not occur on firefox. i think it has something to do with hsts Access Denied You don't have permission to access "http://www.mathworks.com/mwaccount/account/resetpassword" on this server. Reference #18.ae014017.1777097497.efd9222 https://errors.edgesuite.net/18.ae014017.1777097497.efd9222

Firefox will not allow me to sign into Facebook. It will not use this address: https://www.facebook.com/ it only uses this one: https://www.facebook.com/ I have cleared the cache in all Facebook sites in my hisotry.