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I took a look today and I had 237 MB in cookies! This was after clearing the cache of all files. I've only had this (new) machine a couple months.

Short version: Sites have "cookies" from 200kb to as much as 34MB! For many of the sites over 3MB I have no account and have visited them only briefly.

To be clear, I don't care about the space being used. It's trivial. But what the heck is FFox storing and calling it "cookies"? Last I checked, a site was still limited to 4K size cookies and perhaps 50 per domain. So how are we getting to MB+ sized "cookies" per site? Again, the cache was cleared, so what's left aside from trivial cookie files of <4KB?

Desktop; Windows 11; Firefox 139.0.4 64 bit

Hi, as the title says, they stopped displaying after I installed the latest update for firefox for my computer (macbook air with the apple M1 chip). I have checked that in the settings I have "Show an image preview when you hover on a tab" enabled and that in my config I have both browser.tabs.hoverPreview.enabled and browser.tabs.hoverPreview.showThumbnails set to true. What could the issue possibly be now?

I have a problem. When watching videos on YouTube, especially in 4K, it starts to freeze, and the loading screen stays on indefinitely. The same thing happens when you fast-forward or rewind the video. Switching the video to 1440p or 1080p helps, but over time, even at 1080p, it starts to freeze. but if I switch back to 4K, everything works fine, but only temporarily or until I fast-forward it.

I can provide browser data files. I'll say right away that I've tried a lot of things, and even everything that ChatGPT recommended didn't help. I tried changing the about:config settings related to the video player and codecs.

The only thing that helped was installing a plugin (h264ify by erkserkserks) that disables av1, and in that case the video works fine, BUT only at 1080p, which doesn't suit me, as I would like to watch videos in high quality.

If I disable hardware acceleration so that videos are rendered on the processor, then everything works fine and everything runs smoothly, except that the processor is loaded at 60%. This may be a solution to the problem, but I would like to figure it out and solve it completely, rather than looking for a compromise.

Motherboard: ASRock B850M Pro-A (BIOS date 02/21/2025, DMI BIOS version 3.20) CPU: AMD Ryzen 5 8400F 6-Core Processor RAM: Crucial CP16G60C36U5B (Crucial 2x16 - 32GB) Video card: NVIDIA GeForce MSI RTX 3080 Ventus 3X OC LHR (MS-V389) (Driver version: 32.0.15.7652, Development date: May 14, 2025, DirectX version: 12 (FL 12.1)) Video card driver 576.52, May 19, 2025 The entire system and browser are installed on an M.2 NVMe CT1000P3PSSD8 SSD (Crucial P3 Plus 1TB PCIe 4.0 x4) (there are also other drives) (2 monitors 1440p) Windows 11 Pro If any data is required, I can provide it. All drivers and everything else are installed in the latest version (unless new ones have been released or it has not updated itself). All Visual C++ and Windows components are installed, I don't think there is a problem with them.

The problem only occurs in the Mozilla browser; there are no problems in any other browsers. I also noticed that on some websites where I watch movies, there is a problem with the video. Unlike YouTube, they load normally, but in dynamic scenes, the image breaks up, similar to the image breakup in games when vertical synchronization is turned off. That is, the video is divided into two parts, and one of them lags behind by a fraction of a second. I tried resetting the browser settings, but it didn't help. Everything works fine on my MacBook and in other browsers and devices, so it's not related to the internet.

Please help me figure this out and solve the problem because I've already tried everything, and I don't want to switch to another browser because I've been using Mozilla for over 15 years. Also, if you need any information or a detailed explanation, I can show you or even record a video. Everything worked fine on Windows 10 on the same system, but Windows 11 is not running as smoothly. (To clarify, this is a clean system; I did a complete clean install of Windows 11, although when I upgraded from 10 to 11, everything seemed to work fine).

I would be grateful for any help.

Hey, please fix this. After update to firefox 139 video player from youtube can't play. The setting video as low as possible, but still the same. I tried on other website work normally, I think the problem is the flash player, apparently not. Please fix this, ASAP.

Thanks

Hi,

I need help resolving an issue related to browser navigation and the popstate event.

Here's the scenario:

• The user starts on page-1.html.
• They click a button, which navigates to page-2.html.
• When the user presses the browser back button (without clicking any button on the page), I want to trigger a JavaScript popstate event automatically.

Currently, I'm doing the following:

• When the user arrives at page-2.html from page-1.html, I show a popup.
• When the user closes the popup, I manually push a state using history.pushState() to create a backward URL entry.

However, my client’s requirement is to trigger the popstate event without requiring any user interaction on page-2.html, i.e., as soon as the user presses the back button.

Is there a way to programmatically achieve this behavior (ensuring the popstate event is fired) without requiring the user to click anything on page-2.html?

Any guidance or recommended approach would be greatly appreciated.

Thank you.

Until recently Ctrl+Tab and Shift+Ctrl+Tab have work perfectly. Now they do not work at all. Ctrl+Page Up (and Down) works fine.

I have used safe mode, rebooted the computer, checked the general settings in Firefox and the problem persists. What can be done to resolve this?

I realize this is in a beta OS, but I imagine it'll need to be addressed at some point.

Anywho, when using vertical tabs, the left side expand/collapse button lives underneath the close, minimize, full-screen OS buttons.

If I turn on "always use private surfing", can I not have shortcuts on my Firefox landing page?

I had six shortcuts on my landing page; however, I turned on "always be incognito", and my shortcuts disappeared, and I do not see an option to add them back.

Are they mutually exclusive? If not, how do I FIX THIS?

Hello dear helpers, When I click on a webpage link (or right-click a link to open a tab in a container), Firefox repeatedly opens the same tab all across the tab line; maybe 20 or more of the same tab. I would be grateful for help if anyone knows how to solve this. Thanks, -AnneF

In particular, this is running Firefox 139.0.4 (64-bit) under Windows 10, and finding a huge file and activity here: C:\Users\Lab\AppData\Local\Mozilla\Firefox\Profiles\4wyhpro4.default\cache2\entries And, if I simply delete everything there, it seems like it regenerates fairly quickly, whether I've been using the browser or not. What are these strange entries, which look like this growing list: