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when I hit full screen in the lower left on youtube videos it says full screen unavailable on all videos. I have tried all the recommended setting adjustments in the config and they don't work. yet full screen for youtube videos works in all other browsers on my mac which is an M2 pro macbook pro running sequioa 15.7.4

Please fix this as it is really annoying and I may stop using this browser if it is not taken care of. It just started yesteday out of nowhere. No changes were made on my computer during this time.

This must be a setting in Firefox somewhere relating to Tabs, so I will continue to investigate, but... I feel like I could always click an email link I had received and it would open my preferred browser, in my case Firefox Mac OS latest (both) on a last Intel Macbook Pro. Now, a link click opens Firefox but only to the last page I was on, and I again need to click the email link to get the new tab to open. Why/where/help please?!

I have two separate Firefox accounts, with separate emails to log in and their own sets of bookmarks, passwords, etc. I want to merge all the data from both of those into a single profile of a single account under just one of the emails.

I'm pretty sure I've done this before, by: 1. Logging into account A and syncing. 2. Logging out of account A without deleting data. 3. Logging into account B and syncing. With the result that account B now contains all its original data plus all the data from account A.

But when I just tried to do this process now, at the point of logging in to account B I got the error "Account limit reached for this profile. This profile was previously synced to a different account. To keep your data organised and secure, each Firefox profile can only be synchronised to one account. To sign in using [account B], create a new profile."

I don't want to have separate profiles with the data from accounts A and B, I want it all merged into the same profile. How can I achieve this?

I don't see the suggestions when I'm typing. It was the most visited site by me and firefox was autofilling it. Now I can see there's nothing in my history like it is the first time I use firefox. I haven't changed anything in firefox settings or system files etc. It's just got deleted. I'm a MAC user

Hi,

I use Firefox app in macos, android and ipados. The bookmarks across them are not synching automatically. I need to press sync manuelly to do. All apps are updated, all settings look fine. Please help me synch bookmarks across platforms. Thanks a lot.

Although the option to "Delete cookies and site data when Firefox is closed" is unchecked in my settings, I am still getting logged out of all websites when Firefox restarts. This was never the case when I used Safari, and it's quite inconvenient to have to log in to so many websites all over again, especially when two factor authentication is required for many of them.

Is there anything that might be causing this, anything I can check or do on my end so that I am staying logged in on restart? Thank you.

Hi,

I am concerned that when I signed into my bank account today, the saved username which is autofilled by Firefox had been changed. The change was subtle -- from uppercase to lowercase letters -- but it wasn't me that changed it. This is a site I log in to often, almost every day.

Of course I am worried that this is some sort of hack.

Ordered some new checks from Costco as a "guest" since I haven't set up an online account (generally speaking, I wouldn't use, but to order checks, I need to do it online - not in the store). I put my full order together in the cart, went through the full process of completing the order and payment, but after submitting, I expected the order confirmation page. However, I received the notice that the Harland Clarke check printing vendor site won't allow firefox to display the page. Without that confirmation page, I don't have an order number to reference. The instructions provided says to embed the link (which link?) in another tab to open the missing page. I've also tried following all other instructions; going on the Mozilla/Firefox desktop/ trying to find a Mozilla contact phone number, etc. All that happens is that I go into a never-ending circle - which means no-where. What am I missing? This is what I get:

Fix error “Website will not allow Firefox to display the page.” 3–4 minutes

Firefox, Firefox for Android Firefox, Firefox for Android Last updated: 8/24/25 36% of users voted this helpful

Some websites don’t allow their content to appear inside another website. If a site tries to embed a page that blocks this, Firefox will show an error that it cannot open the page:

“To protect your security, [website] will not allow Firefox to display the page if another site has embedded it.”

This is a security feature on the website being embedded. It prevents clickjacking, where a site tries to load another site without permission, often to trick users into clicking something they didn’t intend.

This error is not caused by Firefox. It’s a choice made by the website owner. Why does this happen?

Websites can control how their content is used. They may block it from being shown inside another site using special security settings like:

   X-Frame options headers
   Content security policy rules 

These settings are common for banking sites, schools, government services and others that need tight security. What can I do?

You can still view the blocked content by opening it directly. On desktop

   Right-click the link or embedded area.
   Select Open Link in New Tab or Open Link in New Window.
   If you can’t right-click, try copying the link (long-press on Mac trackpads) and pasting it into a new tab. 

Tip: You can also drag the link into a new tab if using Firefox on desktop. On mobile (phone or tablet)

   Tap and hold the link or embedded area (where the content should appear).
   Choose Open in New Tab from the menu.
   If that doesn’t work, try copying the link (if visible) and pasting it into a new tab manually. 

Warning: On mobile, this may be harder to do if the embedded content doesn’t show clearly. Look for a blank or gray box on the page. What if I need to use the original page?

Sometimes the website that’s embedding the content depends on that embedded page to work properly (for example, a school login system or internal portal).

If that’s the case:

   Try opening the embedded page directly (as described above).
   If that doesn’t help, you may need to contact the site owner and explain the issue. 

Need help understanding this error?

If you're unsure what the page is trying to load or can’t figure out where to click:

   Look for a blank box or missing content; that’s likely where the blocked page should appear.
   If you're on mobile, try rotating your device or zooming out to better view hidden content.
   Still stuck? Copy the page link and share it with your IT support, teacher or website admin. 

Related articles

   Firefox is stuck in Troubleshoot Mode
   Websites look wrong or appear differently than they should
   Site Permissions panel 

These fine people helped write this article:

Latest version of Firefox on macOS, Mac Mini M2 - 8 GB RAM and MacBook Air M3 - 16 GB RAM: Firefox malfunctions on launch - I have to force quit and relaunch it - Firefox starts to load then freezes. Firefox works, then I launch other applications like Chrome, Thunderbird, etc. Firefox freezes on the M2 8GB RAM but rarely on the M3 16GB. A few weeks ago, these problems didn't exist on either of my Macs - since an automatic update that I didn't notice, it's now a consistent occurrence.

UNBELIEVABLE, I've never had this much trouble with a previous update. Your AUTOMATIC update closed all web pages that were open last session, offers no option to restore previous session, and took me 2 hours just to get bookmarks back. I had way too many pages open, but I have lost some important research for work that was in process. Multiple support options didn't work until I found one that would for bookmarks, but the history seems to be unretrievable. Not how i wanted to spend my morning.

I wanted to change my Paypal password. I went to their page, and generated a password, but didn't save it. So I went through the password reset process, and asked Firefox to generate another secure password. Paypal rejected it, because it was the one I used before. Every time I asked Firefox for another password, I got exactly the same one.

Is that intentional? How do I change it, so I get a different password when I ask for a new one?

I use Firefox on a Mac to access Brightspace for my classes. I also use Grammarly. When copying text from the Grammarly widgets and pasting it into the Brightspace HTML editor, the text is stripped of hard returns, causing paragraphs to collapse without any breaks between them.

I have tried pasting as unformatted text, and the issue persists. This issue does not occur in Chrome, so I suspect it is due to how Firefox handles clipboard data. I have not found a workaround or resolution for this.

Using Facebook creates an "Isolated Web Content" which makes the page run slow then crash.

This has been happening for years, now and means I increasingly just don't use Firefox, switching to Chrome, instead.

This affects Facebook on my Mac (Sequoia) and PC (Windows 11) machines.