Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Search Support

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.

Learn More
This thread was archived. Please ask a new question if you need help.
Solved Archived

Firefox saves webpages as .htm instead of .html

Firefox Settings
RandomAccount replied
RandomAccount
RandomAccount

Hi.

Firefox saves webpages with extension ".htm" instead of ".html". It is not very important but I prefer to have ".html" extensions, how can I change it?

It may be linked to this extension (https://addons.mozilla.org/en-US/firefox/addon/mozilla-archive-format/) since I installed and uninstalled it recently. I use archlinux.

Hi. Firefox saves webpages with extension ".htm" instead of ".html". It is not very important but I prefer to have ".html" extensions, how can I change it? It may be linked to this extension (https://addons.mozilla.org/en-US/firefox/addon/mozilla-archive-format/) since I installed and uninstalled it recently. I use archlinux.

All Replies (2)

RandomAccount
RandomAccount Question owner

I think I found the code responsible for that behavior: https://dxr.mozilla.org/mozilla-central/source/toolkit/content/contentAreaUtils.js (line 635).

Am I right? How can I modify that on my computer? (I don't find the file on my computer.)

edit: No, I was wrong.

Modified by RandomAccount

RandomAccount
RandomAccount Question owner

Chosen Solution

I found it at last! I was about to surrender, and noticed a file "/etc/mime.types". In that file there is a line "text/html", some tabs, and "htm html shtml". I changed it to "html htm shtml" and now it works.