Diễn đàn hỗ trợ Firefox

Since the last upgrade Firefox is running very slowly. Many sites that I use daily either take so long to open or don't open at all. I have to open MS EDGE which opens up these sites within microseconds.

I prefer using Mozilla, but unfortunately looks like I may have to move as Firefox is now almost useless for me.

Can anyone suggest anything I could try.

thanks

Muz

CDNsearch engine becomes my Mozilla search most times itself without my permission . each time i change it to Google search engine but again when i open Mozilla after a while i see CDNsearch engine at first page of my Mozilla. how can i delete it permanently ?

I am reporting a technical issue regarding the built-in Firefox VPN feature. It was fully functional in my location (Czechia) until June 15, 2026, but it suddenly disappeared from my toolbar and customization menu on June 16, 2026.

Despite following the troubleshooting steps provided in the official help article "Unable to find the built-in VPN in Firefox," the feature remains unavailable.

Here is a summary of the diagnostic steps I have already performed:

- Data Collection settings: Confirmed that "Allow Firefox to improve features, performance, and stability between updates" is enabled.

- About:studies: I have checked my active studies as shown in image_464983.png. There is no "VPN - MVP Beta Holdback" study listed that would explain the removal of the feature.

- About:policies: The Enterprise policy service is inactive, and there are no restrictions blocking IPProtectionAvailable.

- Account management: I have signed out of my Mozilla account and signed back in, but the VPN icon did not reappear.

- Installation: I have performed a clean reinstallation of Firefox, which did not resolve the issue.

I have also checked the toolbar customization menu and the overflow menu, but the VPN icon is not available.

Since this feature was working perfectly until yesterday, could you please investigate if my account profile has been excluded from the current rollout or if there is a regional issue affecting users in the Czech Republic?

I have attached my about:studies screenshot (Screenshot_about_studies.png) for your reference.

Whenever I try to full screen in any streaming websites, it's not full screen at all. There is a little bit of space in the left-side and top-side of the screen where the other windows or applications I have can be seen (or my desktop if nothing else is open). This is not happening to other browsers. Can you please help me to fix this?

Please show me the settings relating to my connection to triodos.co.uk. I need to remove the digit 9 which appears by default on the login page.

The SSL cert has been installed by the entity (Gridhost) from whom I have bought it for 20 years. And as explained, Firefox still shows it as Not Secure while Chrome say it is secure.

I want to use the VPN, but when I sign in, and click the "VPN" button on the top right of my screen, it just takes forever to load. I don't think it ever loads. Then when I reset, it just says the same thing :Try Firefox's built in VPN.

Hello,

I had seen this topic : https://support.mozilla.org/en-US/questions/1489702, i'am using a GPO to deploy an Lockself (password manager) extension on Firefox 152 on all computers in my company. I wanted to pin to navbar just this extension, because users will ask at first time where is it. I have changed the JSON to pin to navbar :

{

 "{ca613ee6-4211-4ae2-aa3c-d29608461d11}": {
   "installation_mode": "force_installed",
   "install_url": "https://addons.mozilla.org/firefox/downloads/latest/lockself-password-manager/latest.xpi",
   "updates_disabled": false,
   "default_area": navbar
 }

}

But when i reload the GPO on a test machine this GPO isn't applied.

So it seems the bug isn't solved ?

Thanks

Tabs will crash over and over again. I can barely look at any given page for longer than a minute or two. What happened?? Firefox was never like this before. It just crashed in the middle of me typing this LMAO. Using Brave in the meantime. This is ridiculous.

Since the update to Firefox a few days ago, I am no longer able to view PDFs in the browser. They still open, but they show up as blank pages. Is there a way to fix this or to revert back to the previous version of FF?

Thanks.

Hi, I'm using Firefox on Desktop and Mobile. For last couple of months, I've been experiencing a problem of Shopify stores loading. When we open any Shopity website (stores specifically), it never loads. Sometimes it shows blank page and sometimes nothing.

At the same time, those sites are working fine in other browsers e.g. Chrome, Safari.

However, when I switch to other wifi network (jazz.com.pk), then it works on Firefox too. I tried different methods to fix it, but no success. Before the websites were sometime opening, but for lost few days, 0 response.

Not sure, where is this issue, I contacted my network support (nayatel.com), they also unable to figure it out.

I tried everything on my end, but no success. Need your help.

As title says, on my main profile, i dont see any option to use the new tab widgets function. If i make a new profile, it is there on default.

How to add it on my main profile?

Hello,

as you can see in the image I can't select German as spellcheck language even though I have installed the German dictionary. My Win OS and the browser use English but I want German as spellcheck as well.

What I am missing?

Thanks

I just noticed the VPN option. Previously I used another VPN, not for privacy, but to give me a UK IP address so that I could access BBC videos which are normally available only if you are in the UK, and thereby get a UK IP address. I took only the free 1 day trial, not wanting for pay for it, and it worked. However with Mozilla VPN, I still get the message 'This content is not available in your location.'.

I have a lot of parts that I'm not going to see, and that's what you're saying: I don't know about these things. What parts are they not? Everything's working just fine, but what if I want to set it up on my iPad and my iPhone to have it similar to the same setup? How do I go about doing that?

when accessing websites where Cloudfare is part of the sequence the page hangs on cloudfare and the page is not displayed. Every time data is transferred through cloudfare the page hangs on cloudfare rending the search useless.