Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

当サイトはユーザー体験を改善するためのメンテナンスを実施中に機能が制限される予定です。記事を読んでもあなたの問題が解決せず質問をしたい場合は、Twitter の @FirefoxSupport、Reddit の /r/firefox で、サポートコミュニティが皆さんを助けようと待機しています。

Mozilla サポートの検索

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

詳しく学ぶ

このスレッドはアーカイブに保管されました。 必要であれば新たに質問してください。

Website compatibility issues with certain websites

  • 2 件の返信
  • 1 人がこの問題に困っています
  • 1 回表示
  • 最後の返信者: FredMcD

more options

This issue has started to become a problem over the last couple of months. Several websites that I log into frequently are no longer working with Firefox, or are not fully working.

For example, I can't use Firefox for these websites at all. AA.com (gives me a screen that says it's down for maintenance) bankofamerica.com (it allows me to start the login process but when it attempts the 2FA it errors out. ATT.com (everything appears to work, except the chat feature. If I log into att using safari (for example) there is a chat box in the lower right corner. The chat box is not there when I use Firefox.

This is starting to become an issue (and is very annoying) to where I may have to change browsers either to Safari (eh) or Chrome (yuk).

Are some of my settings set wrong? Is there another fix? or......


Thank you Elliot ...

This issue has started to become a problem over the last couple of months. Several websites that I log into frequently are no longer working with Firefox, or are not fully working. For example, I can't use Firefox for these websites at all. AA.com (gives me a screen that says it's down for maintenance) bankofamerica.com (it allows me to start the login process but when it attempts the 2FA it errors out. ATT.com (everything appears to work, except the chat feature. If I log into att using safari (for example) there is a chat box in the lower right corner. The chat box is not there when I use Firefox. This is starting to become an issue (and is very annoying) to where I may have to change browsers either to Safari (eh) or Chrome (yuk). Are some of my settings set wrong? Is there another fix? or...... Thank you Elliot ...
添付されたスクリーンショット

この投稿は James により に変更されました

すべての返信 (2)

more options

I am posting two responses. The first may work on some websites while the second may work on the others.


Make sure you are not blocking content.

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop also see https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/

https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection


Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?


Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

more options