I-Firefox Community Forum

My page throws errors in Firefox Nightly such as

Expected color but found ‘undefined’. Error in parsing value for ‘background-color’. Declaration dropped. preview.htm:1:1

and

Expected color but found ‘undefined’. Error in parsing value for ‘color’. Declaration dropped. preview.htm:1:1

The page references ten CSS files besides having dozens of its own CSS declarations. The issue is tha the reference provided to the error (:1:1) does not indicate where I can find the error. That is, I don't know which declaration is at fault. Is there some straighforward way to find the declaration in question?

Hi, when I want to zoom in to the website page, I cant seem to find the horizontal scroll, thus I cant see the left side of the page that I zoomed in. Please make the horizontal scroll available. Thank you.

After new update (135.0a1) my youtube vids starts with audio but NO actual video. Also it timeline constantly extends (like when you move cursor to timeline is extends verticaly and get more light color) and back to grey state.

I tried remove all addons, clear cookies and private windows. Also previewr of video rly buggy and just spams images(?)

The title sums it up. On May 25, 2026 Round Cube email will not allow me to re-enable Dark Reader. It had been working up to that point. I disabled Dark Reader just to see my email without it, then attempted to enable it. Can not. Interestingly, Round Cube in Microsoft Edge will still allow Dark Reader. So, Firefox Nightly the issue?

Nightly updated this morning and the help menu from the sandwich has stopped working. The menu options display, but none of them function. Mouse click makes the menu disappear as if it's going to show the panel attached to the option.

Version: 129.0a1 Build: 20240613093628

Youtube seem to be having problems with video decoding, previous frames seem to be displayed from time to time. for ex, this video: https://www.youtube.com/watch?v=dFhzMEnCEhY

The same profile works on Firefox 134.0b8 (64-bit) without problems, but not on nightly. If I just disable `media.hardware-video-decoding.enabled` and restart, then the problem goes away on Nightly.

Enabling/Disabling my user customizations don't seem to affect it. Enabling/Disabling addons don't affect it. Using a new empty profile also doesn't affect it, the problem persists. I tried deleting "gmp-widevinecdm" folder and redownloading it, still didn't solve the problem.

I seems to be some sort of regression, it used to work before a couple of days ago. Please fix, I hope the information I provided helps, as I like having hardware acceleration.

I also tried to update the display driver. nVidia Driver: 31.0.15.5176 now 32.0.15.6636

Hi, It is not a question but a bug report. From the version 131 up today the Nightly stopped to initialize quickly as before. Certainly, it is not the windows 10 21H2, the antivirus, the firewall or anything other similar internal problem, just because the Edge and the Opera are working fine and they are four times more rapid than the Nightly. It is just to say, that your procedures to improve the security is transforming the Firefox in a mirror of the usefulness Chrome. I take the time to open the home page of Firefox = 9 seconds, against 0.28 s of the Opera. So, I think you should rethink the security and other hidden setting options of the Nightly, because as is, it is very bad. The big thing that the Geeks from silicon Valley did not have in mind is: There are lot of people that need to find extremely fast a configuration, like to export/import passwords from older browsers, or computers, without need to replace one by one. There are many other things that you decided to hide, but I don't know why. Anyway, I will try to update one more time, then, unfortunately I could not use the Firefox anymore. Further, I want a few add-ons, either if there is any percentage of insecurity. A few times we need afford risks to understand and discovery other problems in the web. We cannot do it anymore with the Nightly.

Hi Team, I am using Linux Mint 20 Cinnamon. Cinnamon version is 4.6.6. The issue is that I was browsing and by mistake I selected one tab then dragged it for sometime and then released the tab but that created a new window and now the old windows are not visible in ALT + Tab function. The windows are showing in the Firefox task manager and also the box icon in the top right corner in that "open tabs". Now I am not able to even change the window or able to access the opened tabs. Attached the screenshot and as you can see in that there are total 4 windows showing in firefox and one as active but in the bottom on the firefox icon you can see its only 1 window. How can I access the remaining 3 windows? Found one ticket (https://support.mozilla.org/en-US/questions/1477845) in this the recommend solution does not work. When I try to click on the window 1 tabs then I do not get any response. I tried both the solution but none worked.

Thanks for the help in advance. @Mozilla team member is seeing please check and fix this bug if possible.

• • When I click application menu or add-ons icons, the menus open to the left of the screen and this is very annoying and inconvenient. Please advise on how to correct this after the update.

I have tried the suggestions as described in the following article: https://support.mozilla.org/bm/questions/1273784 However, am still having the issue. It's as if the settings are totally ignored. I am using version 108.0a1 of Firefox developer edition. Ideally what am trying to achieve is away to disable all features of ETP. I figured setting it to custom with all values unchecked would have done the trick but it's not working. What works is if I add the site to the list of Exceptions for Enhanced Tracking Protection, then I will see all Ads loaded just fine on the page. However, this is not viable for me as I have a large list of sites that I visit, and I need to see the ads on them.

Does anyone know of a way to get around this feature in FF?

Is there another setting am missing from the previous article?

I really do not like the new menu / toolbar in firefox nightly. I guess I hadn't really noticed the changes until now. But it takes up half the page of my browser. Who thought this was a good idea? - to put it smack dab in the middle of the page?! Not me, that is for sure! Ok. So can we see a normal toolbar/ menu bar/ and optional toolbar at the top of the page, please? I like things the way they were. With various options to add buttons and pages or things that we need?? My toolbars were stacked appropriately in roles, with everything I needed on them. And they were always in the same place. Not moving around like toys on the floor. Please, please bring back the old toolbars for this old cranky punk chick. Thanks!! Love Firefox, stop messing with it. 💗💗💗😸😸

It works in Chromium 139 , Firefox ESR 128 , and latest WPS Office. HOW IF A CHINESE USER CANNOT TYPE CHINESE IN LATEST NIGHTLY (Debian forky/sid ,Linux kernel 6.16-rc7-amd64)

I am currently on 133.0a1 (2024-10-04) (64-bit) Nightly and the new tab button to the right of the tabs is missing. It will show up sometimes, but I have to go to customize and move some things around, then start browsing and it will pop back up.

I use that button often, how do I get that back?

Hi, so I've "Show an image preview when you hover on a tab" setting under Tabs section "Off". Preview is not showing but instead there is am empty box like on attached image. I couldn't find any other option to turn that off also.

I'm using latest firefox nightly release.

I have this message after returning from nightly version to the stable one: ``` Using an older version of Firefox can corrupt bookmarks and browsing history already saved to an existing Firefox profile. To protect your information, create a new profile for this installation of Firefox. ```

Out of nowhere, the Nightly browser starts with Windows & a new profile. This forces me to go to Settings to uncheck the setting for Nightly to start when I start Windows.

First, the setting "Open Firefox automatically when your computer starts up" should never, ever be checked by default.

Second, this has happened on both my Win11 computers with Nightly. What is concerning is that somehow a Nightly update out of the blue created a brand new profile--I have a specific profile I use for my Nightly installs--with the start with Windows startup setting checked. This should not happen even with an alpha app like Nightly. The update process should only be using the profile running when the update process takes place.

This forces me to run the Firefox Profile Manager to delete the profile that was created out of the blue.

Honestly, if this is not addressed, I will have to stop using Firefox, Beta & Nightly. I have Firefox since it first was pre-version 1.0, but I refuse to use an app that thinks it is acceptable to make default a setting like Start with Windows startup.

Hello Team, I am having issues with Mozilla Firefox and Nightly Browser sound. If I use another browser, the sound is perfect. I have been using Firefox for years now and am accustomed to it, as well as Nighty, for all browsing needs.

Regards, Roopesh