Question: Whenever I format my computer, I usually just copy/paste all the .ttf and .fon files into the `Fonts` system folder.

I can't be sure 100%, but I think that after I did that, Firefox stopped displaying some website's fonts correctly, and I mean the usual default ones, like Arial, Helvetica, etc.

I don't have this problem in any other program, other than Firefox.

Here is a screenshot of what [Digg](http://en.wikipedia.org/wiki/Digg) looks on my laptop right now:

[![enter image description here](https://i.stack.imgur.com/Zph9q.png)](https://i.stack.imgur.com/Zph9q.png)

It looks weird, the font is messed up somehow.

How do I fix it? I'm on Windows 7, Firefox 3.6.10.

Answer: 
I was just struggling with the same problem (albeit with Google Chrome) and stumbled upon this topic. Because I'm using a PC at work, I don't have the privileges to make registry edits. I found another workaround however, which probably only works on Chrome, but at least it fixed the problem for me. So although it's not about Firefox, I still want to share it, in case somebody else ends up in this topic as well.

1. Open Google Chrome
2. Open a new tab and enter the following in the address bar:

> 
> chrome://flags/#disable-direct-write
> 
> 
> 

3. Click "enable" to enable this switch, disabling the use of Microsoft DirectWrite by Google Chrome.
4. Close and re-open Chrome.

*Source & credits: <https://youtu.be/cHHBnHRcOjQ>*
Go to your firefox preferences, under the "Content" tab there should be a "Default Font" combobox. Try switching the setting to one of the usual Microsoft fonts. If not, it is possible that you simply don't have the Microsoft fonts installed. Apparently, you can get some of the core fonts here: <http://web.nickshanks.com/fonts/microsoft-core-web-fonts>