Firefox Community Forum

I installed the English (US) dictionary add-ons from Mozilla Add-ons (English-US Dictionary and US English Dictionary). Firefox confirms they are installed and shows a “Remove” option, but they do not appear in about:addons under Dictionaries or Extensions. Additionally, the dictionary features are not working on webpages—there is no “define” option on text selection, and no dictionary/lookup functionality appears even after double-clicking words or using context menu options. The add-ons only appear as installed on their web pages.

Expected behavior: Installed dictionaries should be visible in about:addons and provide word lookup/definition functionality in the browser. Actual behavior: Add-ons are not listed in about:addons and provide no visible or usable dictionary features on webpages.

When I hit enter after clicking youtube.com , my screen turns into grey spots where the videos should show and no other written info on screen. What is going on??? I can go in when Safari or chrome.

I have used gmail including calendar and contacts with Firefox for 5 years, suddenly contacts and calendar will not open, has a Firefox upgrade caused this problem?

I have had FF VPN for 2 days Pages load incredibly slowly Videos do not load at all

Do other people have experience with this?

I am no longer using the VPN

Sorry for my bad Englisch

I asked about troubles with passkeys in Microsoft password manager, not Windows Hello. The question was denied. https://support.mozilla.org/en-US/questions/1585824

I am only a home PC customer and have Windows OEM vendor's support only. It supports operation mises about Windows OS and preinstalled applications, but doesn't support Windows's bug trouble shootings. I was denied supporting from FUJITSU CLIENT COMPUTING LIMITED (known as a Japanese company, but a subsidiary of Lenovo now). I copied the raw Japanese text to avoid my failure of translating.

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パスキーのご利用について、お問い合わせをいただいております。

はじめに、恐れながら弊社では、出荷時に搭載されている OSおよび、一部のアプリについてのみ、動作確認をしております。

そのため、[Firefox]については情報を有しておらず、具体的な ご案内を差し上げることが困難です。

[Microsoft Edge]でご希望の操作が可能な場合は、こちらで ご利用いただくことをご検討ください。

なお、[Microsoft Edge]でも同様に問題が生じている場合は、 お手数ですが、[Microsoft Edge]で発生している状況や、 実施されたい作業の内容についてお書き添えいただき、再度 FMVテクニカルセンター(メールサポート)へご連絡くださいますよう お願いいたします。

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By the answer, I lost any support about trouble shooting.

I ask questions. Have Firefox development team previously confirmed that it works? Does you have Bugzilla ID about functionality check with passkeys in Microsoft password manager or something like it?

I had an unusual system crash, and when I restarted Firefox, the History > Restore Previous Session feature was grayed out. Due to the nature of my work, I had a large quantity of tabs open at the time of the crash (please don't judge). I then backed up the contents of the \Library\Application Support\Firefox\Profiles\[session].default\sessionstore-backups\ folder, but unfortunately not the full Profiles folder content. The file recovery.baklz4 does seem to contain my open session info (I can see a recent link in it). Based on web advice, I then tried restarting Firefox, but that didn't solve my issue. I also tried copying in sessionstore-backups files, without success. I then tried the "Session History Scrounger" web application to try and recover links from the contents of recovery.baklz4 because that worked for me in a prior crash years ago, but it doesn't seem to work properly anymore (it only retrieved 4 web pages). Appreciate any guidance as to how I can use my backed up sessionstore-backup files to re-enable Restore Previous Session, or alternatively to scrounge the links that were open at the time of the crash. Greatly appreciate your help! (Please do not suggest using "Show All History"... I have no plans to sort through a dump truck of rice with a pair of tweezers.)

i can see the video detected but when i click on the blue download button it says sadly we failed at downloading that specific video. It does this for youtube videos no matter how many times i try it. i never had this problem before and it seemed to have started in may of 2026

Hi there. Ian here. My home page "www.news.com.au" keeps wanting to lock me out due to apparent addblockers on my PC. I am not aware of any that I have installed and can't find a way to remove them or turn them off. I am also not sure if this is a healthy consideration in any case. Can you Help me please.

macOS 26.5.1 Firefox MAC: 151.0.4 (aarch64)

reCAPTCHA keeps re-appearing espcially after I just cleared recent history in firefox mac And I tried a few things but so far no luck.

Does anyone have any idea how to prevent reCAPTCHA ?

Thank you.

no matter what website when i put on a video it fades between normal and black constantly i dont know if its my computer im not very good at tech it doesnt happen and never happened on google

It seems that after a recent Firefox version update (perhaps to 151.0.3), the "Clear cookies and site data" option is disabled for any container tab. This is really annoying as I like to use this feature often.

Recently, I've noticed that, when I Google something, and it shows those AI-created drop-down options (highlit on the screenshot), clicking on the drop down arrow does nothing; no error, no "dropping down", nothing.

Firefox 151.0.1 64 bit for Arch Linux I am trying to create a desktop app from a website - the ai is saying if there is no + sign in the url box then try More Tools -> Create Shortcut but there is no Create shortcut there. So how to create a desktop app from a website?

I'm unable to type in "Notes" for specific transactions on my Credit Union's web site. It used to work fine until several months ago. The entire Credit Union web site won't allow me to add info or type in a box provided by them for such purposes as it did. I have to use the Safari browser (which I hate using) to do so. HELP!!