Firefox 技術支援討論區

A routine update from Firefox version 99 to version 100 caused Firefox to quit loading web pages, including the Settings page. Firefox appears to load normally but will not display any web page. The only thing that works consistently is Help/About Firefox. System: Lenovo E495 (AMD Ryzen 5 3500U) running Windows 10 Pro 21H2, build 19044.1706 Symptoms:

• Version 100 and higher work correctly in trouble-shooting (safe) mode
• Refresh does not resolve the problem
• Manually removing extensions (NoScript and Cookie AutoDelete) does not resolve the problem
• Uninstalling Firefox and existing profiles (all Mozilla folders in AppData/*), then making a clean install of version 100 does not resolve the problem
• Removing version 100 and reinstalling version 99.0.1 restores normal operation (repeatable with higher versions)
• Updating from version 99.0.1 to version 100.0.2 or version 101.0 does not resolve the problem
• I have not tried removing any Mozilla registry keys

This was going to be a question about Firefox being unable to display the file picker dialog, but I managed to find a solution that worked for me along the way. Since it was nowhere near the top of Google's results, I thought I'll share my solution in the hopes that this would help someone facing this same issue.

The hardware:

• Asus UM425IA Zenbook (AMD Ryzen 7 4700U CPU)

Worked in:

• Ubuntu 20.04 LTS
• Firefox provided by APT repository
• Xorg display server

Not working in:

• Ubuntu 22.04 LTS
• Firefox 99.0.1 provided by snap
• Wayland display server
• File picker worked briefly on fresh install, but something (not sure what) quickly breaks file picker functionality

The symptoms:

• Firefox stopped being able to open file picker dialogs
• Right clicking an image and selecting "Save Image As..." does nothing
• With forms that accept file upload (such as on this post question page "Add images (optional):"), clicking "Browse" does nothing
• File downloads work correctly when set to "Save files to ..." under Settings, but nothing happens when set to "Always ask you where to save files"
• No response to "Ctrl + O" open file shortcut

Similar questions and solutions:

• Fixed by reinstalling Firefox
• Fixed by resetting Firefox
• Fixed with a restart on a Mac
• Fixed by downgrading to Ubuntu 16.04

Things I tried that did not work:

• Disabling hardware acceleration
• Starting with add-ons disabled
• Troubleshoot mode
• Clearing startup cache
• Clearing cookies and site data
• Clearing history
• Refreshing Firefox
• Creating and using a new profile
• Deleting the `xulstore.json` file from the profile directory
• Toggling all permissions under Ubuntu Settings > Applications > Firefox to off and then back to on
• chmod 777 ~/Downloads
• Disabling native file picker "ui.allow_platform_file_picker = false"

And finally, what fixed it for me was to go into "about:config" and change "widget.use-xdg-desktop-portal.file-picker" from "2" to "0". Credit to this post that clued me in.

I really hope this saves someone else 2 days of hair pulling and I would appreciate advice from someone more knowledgeable than me on:

• Why this fixed the problem
• Whether I should be opening a bug report either against Firefox, or Ubuntu
• Whether I should also be changing "widget.use-xdg-desktop-portal.mime-handler" and "widget.use-xdg-desktop-portal.settings", both are currently set to "2"

I wanted to print out an order placed online but could only print part of it.

The order took up about 1.5 pages when displayed in Firefox, but I could only print the upper 2/3 of it. That’s all the Print Preview displayed. It was cut off at the bottom. There was no option to print the missing lower third or a second page.

I can scroll Firefox to display the lower part but Print Preview still shows only the upper part.

I can change FF’s scale to 80% in order to show the whole order on the screen, but Print Preview still only shows the upper part.

I can scale Print Preview to 70%, but then it’s difficult to read.

I don’t recall having this problem with earlier versions of Firefox.

How can I print my order on 2 pages so that I can read it?

Logged into https://www.expedia.com/ the home page tries to open but a second or two later I see a blank, white screen. I "Turned Enhanced protect off" Expedia page still blank I open GOOGLE and Expedia works perfectly

My Firefox browser is out by 4 hours. I am eastern and it recently switched to west coast time zone on its own. It did it once before and fixed itself in about a week. Other browsers are fine. I would like to stick to FIrefox but my shop tells me to switch. Can you tell me how to correct this problem? Thanks, Glen [email removed from public]

More and more I'm having to go to other browsers like Chrome or Edge to open certain websites as they do not work through the Firefox browser. Why is this and how can i get them to work before i change browsers permanently?

I love screenshot by Mozilla. However, recently in the last few months (not sure) when the change happened, the timezone (stamp) at the end of the screenshot is NOT based on the "local" PC that is using it. I am in EST but it shows a different time zone which creates a problem. Since Mozilla Online is China based entity, I believe it is showing their timezone. I checked the settings and I could not find where to change the timezone to local time. This is key for many users as we need a "correct" local timezone.

Previous versions had this feature (automatically) and I did not have to set it up. Can we have the option to change the timezone please? Thanks.

I am running Firefox 99.0.1. Lately (probably since the last update) when browsing the web, Firefox will lockup and not be responsive to clicks on hyper links. The issue goes away when I close Firefox and re-open, but after clicking on 3 or four links, it locks up again. MS Edge does not have this problem with the same websites. I did notice in Task Manager that Firefox is opening up 10 processes. Can anyone give some suggestions?

Couple days ago Yahoo Mail stopped downloading attachments of any type. Only happens when using Mozilla. Yahoo mail works fine with edge and android. The following had no affect: (1) signing out and in to yahoo mail. (2) Clearing cache etc in Mozilla (3) rolling back recent windows updates. Occurs with all types of attachments, so not an app issue. Appreciate your help, please include only those suggestions which consider the "suddenly" part...

I am running Firefox 99.0 on an iMac with MacOS Catalina 10.15.7. With a recent update to Firefox I can no longer print using the system dialog box as default. I did already try switching the "print.tab_modal.enabled preference" to "false" and that simply doesn't work. When that flag is set to "false" and I print from within Firefox, the Firefox print dialog comes up, not the system print dialog. Why can't I change it so that the system print dialog comes up by default?????

Good day! I trust you all are well. I am using a Kensington Expert Mouse (wired, K64325), and KensingtonWorks application for settings. Although I use the slowest scrolling speed, the scrolling is still very fast i.e. one click is a full screen. In other applications the settings are working well. How can I slow down the scrolling? Many thanks and regards, Konstantin

Today I tried to place an online order to pickup from Texas Roadhouse, but no matter what time I chose a message said it was not available. The only selection that worked was "Earliest Available Time". Finally I called to place an order. Firefox worked 2 months ago but I don't recall which version I was using at the time.

Today I was using FF vers 97.x and later updated to vers 99.0.1 figuring that might be the problem, but it made no difference.

Later I tried Windows 10 Edge & that worked. Then tried a Chromebook & that also worked.

I've also had problems going to the Tracfone website & so have several other people. It's hit or miss with Firefox & usually it doesn't work. But Chrome or Edge seem to work for everyone.

Is this a website problem or a FF problem?

Hi there , I am interested to know if Mozilla support group is aware of the problem Microsoft update KB4474419 causes? I am running widows 7 sp1. I installed the update as you mentioned in your Firefox 100 release notes. After reboot , I got a beep and a black screen - win 7 won't start. I had to find a way to delete the update so I could boot my system back. I asked few of my colleagues that use the same OS and they experienced the exact same problem. Surfing the web , makes it quite clear - this update is faulty and not compatible with win 7 as Microsoft claims. I would like to get a straight answer - can I update my FF99 to FF100 , without the notorious KB4474419 , or , as of FF100 , win7 sp1 is no longer applicable to Firefox ? Thanks. look4

MacOS Monterey 12.3.1 FF 99.0.1 Have tried clearing Cache, Cookies, Troubleshoot mode.

Google Maps > Search > Share > Embed a Map, the map to be embedded is not displayed (likewise when embed is pasted into Wordpress page, for example)

While same procedure in Safari or Brave works as expected (map to be embedded is displayed in Google maps and embed code displays map in webpage using Brave or Safari).

From the Google Maps page > share > Embed a map > right click This Frame > Open in new tab And then looking in the Console. There are a few other ignored errors but then this...

Loading failed for the <script> with source “https://maps.googleapis.com/maps/api/js?client=google-maps-embed&paint_origin=&libraries=geometry,search&v=3.exp&language=en&region=us&callback=onApiLoad”.

Looking for free border designs, and have found the add-on easy search tool required for most of them. Their web site has the add-on for Firefox, but how safe is it? Thanks.

I would like to enable picture-in-picture without constantly having a popup for it anytime my cursor goes onto the video screen. You could just put a button somewhere out of the way. It's so annoying I have to just disable it, and that's not right. Nobody needs popups of any kind for anything ever. It's the same as an ad.

On certain websites I notices I have 'unknown errors' when trying to log in.

Usually this is remedied by either using Chrome or clearing cookies and the cache.

Both of there are inconvenient and result in a great deal of wasted time.

The usual response by these websites is "get Mozilla to fix this".

I'm getting sick of this.

I don't want to switch to Chrome but I will have to if this persists.

I've noticed there is a "verified by Amazon" icon in my address bar next to the FF shield. How did it get there, can, or should, I remove it and how. I don't trust anything Amazon does, so if possible I would like it to be gone.