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Firefox built-in PDF viewer stuck in light mode when privacy.resistFingerprinting is enabled

Hi everyone, After enabling `privacy.resistFingerprinting = true` in `about:config`, I noticed that Firefox’s built-in PDF viewer (`pdf.js`) is always displayed in **lig… (read more)

Hi everyone,

After enabling `privacy.resistFingerprinting = true` in `about:config`, I noticed that Firefox’s built-in PDF viewer (`pdf.js`) is always displayed in **light mode**, even though my system and browser themes are both dark.

I understand that RFP forces `prefers-color-scheme: light` to prevent fingerprinting, but this also affects internal components like the PDF reader. Unfortunately, the PDF viewer doesn’t provide a manual dark mode toggle.

Is there any **official or safe workaround** that allows keeping RFP enabled while still having the PDF viewer use dark colors?

Thanks!

Asked by Xinyue Wang 4 hours ago

Last reply by Paul 3 hours ago

Incessant Crashes

Firefox repeatedly crashes on my, multiple times a day. I'dc really like to NOT have to change my default browser to Chrome. What happens is that Firefox freezes, and I… (read more)

Firefox repeatedly crashes on my, multiple times a day. I'dc really like to NOT have to change my default browser to Chrome.

What happens is that Firefox freezes, and I get a white bar at the top telling me so. I get a popup box asking if I want to close Firefox or wait for it to respond. Waiting doesn't work, so I always have to close Firefox. When I reopen it, fortunately all m,y open tabs are retained, but it crashes again within minutes or seconds as soon as I click on anything.

There only thing that seems to work is a reboot of my PC. But the respite is short before Firefox crashes again.

I've disabled most plugins, but that hasn't helped. Is there a way to create an event log within Firefox that I can share with someone at Mozilla to help e debug the issue? It's got to be something local rather than Firefox itself; I can't imagine this is happening to most users.

Asked by BillTreloar 4 days ago

Last reply by Paul 5 hours ago

Transfer Firefox using sync

Hi. I am trying to migrate Firefox from my wife's laptop to her new one, using sync. I've followed the instructions, set up sync on the old one, then set up sync on the n… (read more)

Hi. I am trying to migrate Firefox from my wife's laptop to her new one, using sync. I've followed the instructions, set up sync on the old one, then set up sync on the new one with the same account. Nothing changes! Where am I going wrong? Or will I have to do a manual transfer instead?

Asked by tony54 6 hours ago

Last reply by Paul 5 hours ago

strange font

hi in a new win 10 instal most text incl Fire Fox text is made up of letters [font] that are made of thin and thick lines [in the same letter] i dont know if its a stra… (read more)

hi in a new win 10 instal most text incl Fire Fox text is made up of letters [font] that are made of thin and thick lines [in the same letter]

i dont know if its a strange font or another problem, i have copied all "font" setting from my other pc where i dont have the problem.

also i cant get spell check to work here dsespite turning it on

its very distracting, would be very gratefull for any suggestones if any one can 

help thanks

Asked by bill 3 days ago

Last reply by Mark 6 hours ago

Why is it impossible to sign into my Outlook account on Firefox?

On all our computers it seems impossible to sign into Outlook...several laptops and 3 desktop...even a new Apple device. Enter your email address and then taken to the ne… (read more)

On all our computers it seems impossible to sign into Outlook...several laptops and 3 desktop...even a new Apple device. Enter your email address and then taken to the next page (see attachment). sign in works with Edge! This has been happening for maybe a month. Very frustrating! NEVER opens the next security window, the 'spots' just keep moving forever...selecting "Back" just repeats the cycle.

Asked by sandhilllv1 3 days ago

Last reply by Paul 8 hours ago

Instead of special symbols (ã and other special letters) i see Cyrillic

It only happens on some websites (Wikipedia for one) and doesn't happen anywhere else in my system. I was unable to root out the reason for this and all solutions seem to… (read more)

It only happens on some websites (Wikipedia for one) and doesn't happen anywhere else in my system. I was unable to root out the reason for this and all solutions seem to be for when there are boxes instead. I don't see boxes, only Russian letters for some reason.

Asked by polinezia0 1 day ago

Last reply by George Kitsoukakis 19 hours ago

New PC

Not sure when I download Firefox to new PC ,How do settings I currently have in place transfer to new browser installation? Also I have bookmarks on a memory card,Will t… (read more)

Not sure when I download Firefox to new PC ,How do settings I currently have in place transfer to new browser installation?

Also I have bookmarks on a memory card,Will they install to firefox by placing it in drive slot of my new windows11 machine?

Asked by KNoaT3 22 hours ago

Last reply by Paul 19 hours ago

Extremely Frustrating Experience Creating Firefox Profile Shortcuts — Leaving Firefox

Hello Mozilla community, I want to share my extremely frustrating experience while trying to create desktop shortcuts for Firefox profiles. I have two profiles, and desp… (read more)

Hello Mozilla community,

I want to share my extremely frustrating experience while trying to create desktop shortcuts for Firefox profiles. I have two profiles, and despite following all standard methods (including manually navigating to the profile folders), nothing worked. The usual steps, including directly creating shortcuts from the profile folder or using suggested tools, failed.

I specifically wanted a way to create exact shortcuts for each profile without manually editing anything. Even after testing everything, the only option left seems to be permanently leaving the profile inside Firefox and opening it from there, which defeats the purpose of quick access.

Due to this unnecessarily complicated process and lack of practical solutions, I have decided to leave Firefox permanently and switch to another browser.

Has anyone successfully created direct shortcuts for multiple Firefox profiles in Windows 11 without manual editing? Any practical advice would be appreciated, although I’m already moving away from Firefox.

Thank you. https://chatgpt.com/share/68e37504-cb3c-8002-8b05-f93a0edb5e02

Asked by DGArke 1 day ago

Last reply by Paul 1 day ago

Website Not Fully Working Using Firefox But Works Fine Using Chrome or Edge

Why do some websites not work fully on Firefox but work fine using Chrome or Edge? I had an issue with https://www.acmemarkets.com/. The product search feature of the w… (read more)

Why do some websites not work fully on Firefox but work fine using Chrome or Edge? I had an issue with https://www.acmemarkets.com/. The product search feature of the web site did not work using Firefox but worked fine using Chrome or Edge. This has only recently started to be an issue.

Asked by tgditmer1 1 day ago

Last reply by Paul 1 day ago

Data synchronization failed.

Hi, I created mozilla account and turned on synchronization to save my passwords, history, etc. After I done it, I formatted my pc. Now I've just downloaded mozilla and l… (read more)

Hi, I created mozilla account and turned on synchronization to save my passwords, history, etc. After I done it, I formatted my pc. Now I've just downloaded mozilla and log in to my account to see that NONE of my data were saved... How is it even possible? I turned synchronization on and then selected which data I want to save. Will you be able to help my with that?

Asked by mikug 1 day ago

Last reply by Denys 1 day ago

Firefix not loading pages correctly

Good morning, Firefox is not loading webpages correctly this morning. From Gmail not displaying or opening individual emails, Amazon not opening, to youtube and several… (read more)

Good morning,

Firefox is not loading webpages correctly this morning. From Gmail not displaying or opening individual emails, Amazon not opening, to youtube and several other sites not loading or displaying correctly. I had no issues at 9 PM PDT yesterday.

No changes to the computer, and everything is up to date.

I have successfully opened the above mentioned sites and others on MS Edge this morning.

Thanks!

Asked by 4bcorp 2 days ago

Last reply by Paul 2 days ago