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How do I reinstall Firefox FROM SCRATCH when older settings (but not the .exe itself) is still on a Windows PC? Will deleting all entries in Windows Registry fix it?

Background is that I switched Sata cables for some hard drives (for an unrelated experiment), of which one contained the Firefox installation on D:. Then I ran Firefox, and somehow it seemed to work and I also was promted to install an update which I did. After some days I switched back Sata cables. Now I cannot uninstall old instances of Firefox that I can see in Win Settings -> Apps. Worse, I cannot install Firefox anywhere AND also make Firefox running without a crash after a few seconds. To remove all info in registry and hard drives might be the way to solve this?

The operating system is Win11 Professional 24H2, the browser version is 141.0 (64 bit)

When I use Firefox to open any webpage and upload files, the browser will freeze. Specifically, the browser cannot perform any operations (including clicking on webpage links, switching tabs, scrolling pages, opening debugging interfaces with F12 ...). The larger the uploaded file, the longer it will freeze. However, for the same website on this computer, using Edge or other browsers, there will be no lag. But I don't think the above malfunctions are caused by the operating system version or browser version. Because this malfunction has been present for a long time, the computer's operating system and browser have been constantly updated, and no matter what version is updated, there will always be this malfunction

For the past 2 months I've found it very difficult to sign into my Hotmail account using Firefox. Microsoft keep telling me to use a VPN or another device. I like answering emails on my computer because of its large screen. I've tried signing in about 2000 times now. Firefox told me they can't help me because I'm not a Mozilla subscriber even though they own Firefox. Microsoft told me it's Mozilla's problem. Can anyone help me please. John in the Philippines.

I need to return to using POP from IMAP. In addition to changing the server settings, can I replace the current Profile directory with the last known working one? If so, is there anything else I need to do, besides backing up the current email directory?

As a user in China, since the domestic version of Firefox was discontinued, I switched to the international version. However, I’ve encountered a frustrating issue regarding how history entries open: When I click on a history entry in the right-side history sidebar, it overwrites my current tab by default. To open it in a new tab, I have to manually press the Ctrl key while clicking — which breaks my long-standing browsing habit. Previously, in the version I used (the domestic variant), a simple click on a history entry always opened it in a new tab. Strangely, the left-side history panel (if applicable) also opens history entries in new tabs without overwriting. This inconsistent behavior between the sidebar and other interfaces is confusing. I understand some users might prefer overwriting the current tab, but flexibility is key. Could Mozilla add a configurable setting (e.g., in about:config or the preferences menu) to let users choose:

   Option 1: Overwrite the current tab when clicking history entries.
   Option 2: Open history entries in a new tab by default.

This would respect diverse user habits and resolve the mismatch between the sidebar and other history interfaces. Thank you for considering this improvement! 我是一个中国地区的用户，因为国内的停运了，现在更新了国际版的火狐，但是在用到国际版的火狐中，我遇到了这个问题：在当我点击历史记录时，会把我当前的标签页覆盖，如果需要不覆盖当前标签页，则需要我按住ctrl再点击。在这之前，我用的版本一直都是在新标签上打开历史网址的，然后我发现在左侧的历史记录这，点击历史记录则不会覆盖标签页，也是新打开一个标签。这让我很苦恼，我之前一直的习惯逻辑都是点开就可以了，而且是点开右边的历史记录侧边栏。我希望能够增加个设置什么的，可以给予用户选择的权利，如果有人希望点开历史覆盖当前页面，则覆盖，希望新打开标签页的则可以打开新标签页。

Sometimes when I run a search in Tbird (Ctrl+Shift+F) the results window judders up and down. Any ideas why, or what is causing this? Running under Win 10; both win and TB updated for all patches. Thanks.

Today: DevTools crashed many times, and I’m facing unusual issues. I cannot call through Messenger and cannot connect for video calls. Also, DevTools is not working, even though Firefox Developer Edition is quite good and healthy. Even Firefox is not working well. Please fix this issue quickly.

OLD ISSUE

My Firefox is using a lot of data; I don’t know why.

I am not using Firefox, and it is not running in the background, yet it is always using the internet. So what do I need to do in this situation? I tried to stop the internet connection using outbound rules, but it did not work. It is still using the internet. What is the reason my browser has high data usage? I have high data usage; in fact, in the past 12 days, we've used 30+ GB of data.

Since Thunderbird v. 140.1 installed, have been unable to send emails. Get pop-up instruction to check password. Using AOL, which requires OAuth2. But OAuth2 no longer appears in the Authentication Method drop-down menu.

As a user in China, since the domestic version of Firefox was discontinued, I switched to the international version. However, I’ve encountered a frustrating issue regarding how history entries open: When I click on a history entry in the **right-side history sidebar**, it **overwrites my current tab** by default. To open it in a new tab, I have to manually press the *Ctrl* key while clicking — which breaks my long-standing browsing habit. Previously, in the version I used (the domestic variant), a simple click on a history entry always opened it in a new tab. Strangely, the **left-side history panel** (if applicable) also opens history entries in new tabs without overwriting. This inconsistent behavior between the sidebar and other interfaces is confusing. I understand some users might prefer overwriting the current tab, but flexibility is key. Could Mozilla add a **configurable setting** (e.g., in *about:config* or the preferences menu) to let users choose: - Option 1: Overwrite the current tab when clicking history entries. - Option 2: Open history entries in a new tab by default. This would respect diverse user habits and resolve the mismatch between the sidebar and other history interfaces. Thank you for considering this improvement! 我是一个中国地区的用户，因为国内的停运了，现在更新了国际版的火狐，但是在用到国际版的火狐中，我遇到了这个问题：在当我点击历史记录时，会把我当前的标签页覆盖，如果需要不覆盖当前标签页，则需要我按住ctrl再点击。在这之前，我用的版本一直都是在新标签上打开历史网址的，然后我发现在左侧的历史记录这，点击历史记录则不会覆盖标签页，也是新打开一个标签。这让我很苦恼，我之前一直的习惯逻辑都是点开就可以了，而且是点开右边的历史记录侧边栏。我希望能够增加个设置什么的，可以给予用户选择的权利，如果有人希望点开历史覆盖当前页面，则覆盖，希望新打开标签页的则可以打开新标签页。谢谢

For the past year, I have had to stop using Firefox because I cannot figure out how to change the font in my Macbook Pro, OS Sonoma 14.6.1. I cannot even see the "preferences" in settings to fix the font either. See the attached images.

When I open my own webpages in Firefox, they don't load the correct breakpoint for a mobile device. When I try chrome or Firefox on a fresh device, everything works. Are there some settings, that may break the site like this? Thanks for support.

First image: page in Firefox Second image: page in chrome

Hello: I am trying my hardest to figure out how to move my existing Firefox profile folder (with bookmarks, passwords, etc.) to a new system. I have tried repeatedly to take the contents of the existing profile, and past them into the default profile on the new system. None of the information shows up.

The existing profile is version 115.25.0, running on a Windows 7 Pro platform.

The system I'm trying to move the profile to is a Windows 10 Pro 64 bit system. I installed the same version of Firefox on the target system.

All the files from the existing system seem to copy over to the new default profile folder fine, but no luck when Firefox is opened.

I also tried copying the entire profile folder over (leaving the folder name intact), and removing the default profile that was set up by Firefox. When I do that it just gives me a message saying it can't find the profile.

Don't know what else to do here. I have a lot of data in the old profile that I don't want to have to re-create.

-S