The media could not be loaded, format is not supported.

On a trusted website, for a class which I paid a lot of money to attend, I get this error message, on FireFox only: The media could not be loaded, format is not supported… (อ่านเพิ่มเติม)

On a trusted website, for a class which I paid a lot of money to attend, I get this error message, on FireFox only: The media could not be loaded, format is not supported.

I used to LOVE Firefox,but I'm getting frigg'n irritated by it right now. Chrome and Safari both open this page. I had this same problem a few days ago, was sent a long list of possible ways to deal with it that were all over my head complicated. I chose the simplest one- to clear caches, and it worked! yay, for a couple of days, now the error is back. I there must be a different solution , or cause, than the cache one - What needs to be turned on or off, so this doesn't happen? Too complicated, too frustrating.

I'd love it if someone could give me some more ideas on this. Macbook Pro 16" 2021, IOS Monterey 12.1

Thank you!

ถามโดย Paula Z. เมื่อ 2 วันก่อน

ตอบกลับล่าสุดโดย cor-el เมื่อ 27 นาทีก่อน

Secure Connection Drops

Hello. First, fantastic work on the browser! Second, recently my secure connection to a specific site keeps dropping. I use Firefox to connect to tutanota.com (de). I hav… (อ่านเพิ่มเติม)

Hello. First, fantastic work on the browser! Second, recently my secure connection to a specific site keeps dropping. I use Firefox to connect to tutanota.com (de). I have HTTPS Everywhere and uBlock Origin installed. Before recently, I never encountered this issue, now it's happening every day. When I first log in it's working as expected, zero issues. After about 30 minutes to an hour I now see the error stating that my connection is not encrypted, and mentions something about loading external images. I already told the support team at Tutanota that I have no images loading, but it's still showing the error. They said the connection should still be secure, but that doesn't make sense if the browser itself is saying it's not secure. It happened around the time where I also had DuckDuckGo Privacy Essentials installed as well, but I have since uninstalled that add-on. Still showing error. Please advise.

ถามโดย RG - Work เมื่อ 9 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย cor-el เมื่อ 35 นาทีก่อน

My start up pages have disappeared

i had like 4 or 5 startup pages. i reinstalled firefox and synced twice so it could reclaim them from my home computer but nothing happened. i tried to redo it and the op… (อ่านเพิ่มเติม)

i had like 4 or 5 startup pages. i reinstalled firefox and synced twice so it could reclaim them from my home computer but nothing happened. i tried to redo it and the option is not there. not sure if this was an update but if so i hate it. i added 3 of my startup pages to the home button. so maybe i can get them from pressing that. but i prefer to have them on startup and just have one page as my home page.

ถามโดย kdf_333 เมื่อ 13 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย jscher2000 เมื่อ 1 ชั่วโมงก่อน

Is there an equivalent to the Electron JS that uses the Firefox engine instead of Chromium?

When it comes to making cross platform apps, I know there's lots of solutions out there. However, It somewhat bugs me that the bulk of the ones that allow for the usage … (อ่านเพิ่มเติม)

When it comes to making cross platform apps, I know there's lots of solutions out there. However, It somewhat bugs me that the bulk of the ones that allow for the usage of Javascript/Typescript* for the frontend are based either on Google-developed tech (Electron, CEF, etc), or Facebook (React Native, etc).

Doing an internet search does not (easily) reveal of there are any initiatives to have something along the lines of "like Electron, but uses Quantum instead of Chromium".

Does such a project exist?

Thank you in advance!


  • Yes I know JS and TS are not as performant as C/C++/Rust/etc. That issue, (and whether to use technologies such as QT, GTK, etc.) is worthy of an entirely separate discussion that is out of scope for the purposes of this question.

ถามโดย TechViking เมื่อ 10 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย jscher2000 เมื่อ 1 ชั่วโมงก่อน

Windows 10, Firefox 96 - Dark Mode Active Tab Is Indicernible From Others

With W10 set to Dark Mode and Firefox set to Dark Mode, I am unable to discern the active tab from the others at the top. There should be an outline or color difference f… (อ่านเพิ่มเติม)

With W10 set to Dark Mode and Firefox set to Dark Mode, I am unable to discern the active tab from the others at the top. There should be an outline or color difference for the active tab to make switching to another chosen tab easy. I am forced to change the Firefox Theme to one that actually does this. I don't understand why the default dark theme in Firefox doesn't do this. Will there be a change in the next version?

ถามโดย dcbayles32 เมื่อ 6 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย jscher2000 เมื่อ 1 ชั่วโมงก่อน

Firefox is still usable if you cancel master password prompt.

Firefox is still fully usable if I press cancel when it prompts me to enter my primary password. Is there possibly a fix for this?

ถามโดย ersurvaunt เมื่อ 2 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย cor-el เมื่อ 1 ชั่วโมงก่อน

XPCOM problem ONLY with ESET Internet Security protected browsing

I can use firefox just fine (win10 home, v2004, os build 19041.1415)- I only get the XPCOM error when trying to open the Eset protected browsing window (for banking and p… (อ่านเพิ่มเติม)

I can use firefox just fine (win10 home, v2004, os build 19041.1415)- I only get the XPCOM error when trying to open the Eset protected browsing window (for banking and protection). This has not happened before when using/updating Firefox and only just happened when I updated Firefox today to 96.0.2.

I've been browsing the XPCOM queries and have tried the basic reinstall (deleting program folders prior to installing) with no luck, but so far but wanted some clarity prior to trying other things-

Some of the answers here point out that security software can block the folder access when Firefox attempts updates/installs. I attempted an install with Eset paused, but no change. On another computer, a similar problem - a firefox error message occurs when trying to run the Eset protected browsing window, so attempted the same "program folder delete>reinstall" method, only now when clicking the Eset window, it just gives the loading symbol then nothing happens. Again- Firefox also works fine on that computer as well save for the same protected window usage. Not the same error, but still similar enough to think it's related.

Is a safe mode firefox install the next step forward? Should firefox be uninstalled prior to doing so? (Not just deleting the program folders via file explorer, but an actual uninstall process). Or is this something that should be breached with Eset tech support (beyond just pausing the internet protection and functionality, should it be uninstalled prior to firefox reinstall and than installed again afterwards)?

Please advise and thank you in advance!

ถามโดย q639fn+3xfkbdy00tg38 เมื่อ 4 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย jscher2000 เมื่อ 1 ชั่วโมงก่อน

Saved tabs disappear after I close Firefox

I have a set of tabs (web pages) that I use when I open Firefox. Over the past 4 - 6 weeks the tabs all go away after I shut down Firefox. When I reopen it has a single… (อ่านเพิ่มเติม)

I have a set of tabs (web pages) that I use when I open Firefox. Over the past 4 - 6 weeks the tabs all go away after I shut down Firefox. When I reopen it has a single tab. It is frustrating since I am working on a project and have to reopen 8 tabs.

It worked for many years and now it has stopped.

Help, please!

ถามโดย dan.cronin.cos เมื่อ 2 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย jscher2000 เมื่อ 2 ชั่วโมงก่อน

fire fox refresh

Firefox caused a refresh and now I have lost all my extensions etc. A. Why did it do this refresh? B. Is it time for me to now change to a better browser, as now I will… (อ่านเพิ่มเติม)

Firefox caused a refresh and now I have lost all my extensions etc. A. Why did it do this refresh? B. Is it time for me to now change to a better browser, as now I will have to find all re install all my extensions etc. This sucks big time..

ถามโดย gerryatrick1900 เมื่อ 2 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย jscher2000 เมื่อ 2 ชั่วโมงก่อน

Release 96.0.1 streaming problem.

Since install of release 96.0.1, all drm streaming on pc has failed. Running windows 10 pro. Have cleared cache, restarted pc and router, refreshed and then reinstalled f… (อ่านเพิ่มเติม)

Since install of release 96.0.1, all drm streaming on pc has failed. Running windows 10 pro. Have cleared cache, restarted pc and router, refreshed and then reinstalled firefox. no luck. then i reverted to release 95.0.2 and everthing worked fine. but then, despite the fact that i disabled auto updates, release 96.0.1 was reapplied and streaming was broke again. cannot use amazon prime or comcast streaming services. youtube works intermitently. why was current release reapplied regardless of auto update setting and why is streaming not working? streaming works on chrome but not firefox. i have been using firefox for as long as it has been around. must i now be forced to use chrome instead?

ถามโดย david.l.kammeyer เมื่อ 9 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย FredMcD เมื่อ 2 ชั่วโมงก่อน

Problems wit Firefox 96.0.1

On two different PCs, mine and that of another family member, when we open up Firefox it does not go to the default home page we have set but rather opnes up the last web… (อ่านเพิ่มเติม)

On two different PCs, mine and that of another family member, when we open up Firefox it does not go to the default home page we have set but rather opnes up the last web page we accessed or alternatively we receive a message that it is "having difficulty open that page".

What can be done

ถามโดย richard.flavel เมื่อ 3 วันก่อน

ตอบกลับล่าสุดโดย FredMcD เมื่อ 2 ชั่วโมงก่อน

Firefox & Yahoo mail

Starting on 1/2/2022, every time I go to access my Yahoo mail; I've been getting a dialog box that states "The continued use of the Firefox Browser might cause issues wit… (อ่านเพิ่มเติม)

Starting on 1/2/2022, every time I go to access my Yahoo mail; I've been getting a dialog box that states "The continued use of the Firefox Browser might cause issues with features, usability & accessibility to Yahoo Mail. To continue without issues, we suggest that you download Chrome, IE, Safari". What has happened to FF or is it a Yahoo issue? Also, it's only after I click on my mail icon on my home page to open my mail. This is quite annoying to have to click off the box and wait for the page to reload about as fast as NetZero dial-up of the mid 90s.

ถามโดย Sonny65 เมื่อ 9 ชั่วโมงก่อน

ตอบกลับล่าสุดโดย jscher2000 เมื่อ 2 ชั่วโมงก่อน