Firefox コミュニティフォーラム

I am subscribint to TheHybridLayer.com and the video requires access to player.vimeo.com. Unfortunately, the pop up message is saying that "Did Not Connect: Potential Security Issue." Please help me address the issue since I overwhelmed with this.

Current situation : I am using Macbook Air 11" 2015, MacOS Catalina, Firefox 145

I have my desktop extended across two displays. If I disable Hardware Acceleration in Firefox, entering fullscreen causes the window to be slightly offset down and right, leaving a thin band on the top and left sides of the screen where the desktop background and taskbar are visible behind the Firefox window.

From testing I have determined that this issue does not occur if I only have one monitor enabled or the monitors are mirroring the same display. I have also determined that the issue only occurs when Hardware Acceleration is disabled.

How do I get rid of new, but stupid vertical sidebar? I do NOT NEED OR WANT even MORE junk taking up the screen space. Is Mozilla part of Microsoft now? How do I get rid of that junk?

Heya,

I am the maintainer of the British Dictionary.

For one year that I have been working in the "shadows" on my version of US+Canada+Australian, to be released on 1-JAN-2026.

Can I add your list of proper names (~5000 words) to my dictionaries and release the dictionaries as LGPL?

https://searchfox.org/firefox-main/source/extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/5-mozilla-added.txt

Thank you!

As of Nov. 12th, 2025 (Firefox Version 145.0 (64-bit)) entering full screen for a video reveals desktop/other program windows.

Tested with different websites, YouTube, Amazon Prime Video and Hulu. Issue is consistent across.

In the images provided there are two sets, one full screen the other not. Set desktop background to bright green to highlight issue.

If it matters, using dual monitor setup (BenQ Mobiuz EX2510) both are 1080p 144hz side and issue occurs on both monitors.

Have already tested basic troubleshooting issues such as restarting Firefox and computer.

Thank you.

do know computers very well, have used firefox for all my web browsing, firefox kept crashing according to screen so it opened saved apparent older version and I lost all my bookmarks and passwords, please help

I restarted my computer, but my tabs did not reappear. I restarted, but I have lost all my bookmarks, and I cannot add bookmarks. All Mozilla recommendations have failed.

Hi all,

I just updated from v143.0.3 to v145.0 and once again some small breakages in my userChrome.css have occurred.

Things have become too rounded, including tabs, the URL bar, and the chevron button.

I've solved the tabs radius issue with the .tab-background {} selector.

However, my URL bar now has rounded corners. I would like it to be square.

Please see the attached images for before & after views of my URL bar.

I have this code in place...

#urlbar > #urlbar-background, #urlbar[breakout][breakout-extend] > #urlbar-background, #searchbar
{ border: 1px solid #a1a6b5 !important; outline: none !important;   border-radius: 0px !important; }

I've also tried this as a standalone...

#urlbar-background {
  border-radius: 0px !important;
}

But the above has no effect, although it did previously.

Is there a new way to control the radius of the URL bar?

Also, my chevron button became too rounded. Is there a new way to control that as well?

Thanks.

Hello. The last few days iv noticed that if i have firefox on my second monitor maximized, i have a thick white line at the top now, yet iv never had this before in all the years iv used firefox

Is anyone else getting this?

Ive been receiving server failure reports from several links at numerous websites including zillow and carvana. Links that I try to open from Mozilla Thunderbird, receive the error or show only a blank page. Is there an issue with Firebird or Thunderbird at this time?

I came from IBM Mainframes to PC's in the dawn of time. My obsessive-compulsive computer hygiene can't tolerate seeing anything blemish my clearly arranged desktop, nevermind an executable file and unsightly shortcut-icons, I know how to use existing commands, menus and taskbars, thanks. How do I move the firefox.exe from my desktop back into the C: root program files folder? I have tried all the usual old-tricks but she won't launch after modifying paths etc. Please help.

I use a portal for work and am required to download a variety of documents for specific tasks. When I download certain documents, predominantly Word documents, they are saved with a file name that ends with the word attachment, e.g. 'abcd.docx,attachment'

This does not happen with any other browsers that I use and I know the obvious answer is to use those but I'm interested as to whether anybody else has had this problem and whether they have found a solution?