Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

1. Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
2. Under "Time range to clear", select "Everything".
3. Now, click the arrow next to Details to toggle the Details list active.
4. From the details list, check Cache and Cookies and uncheck everything else.
5. Now click the Clear now button.

Further information can be found in the Clear your cache, history and other personal information in Firefox article.

Did this fix your problems? Please report back to us!

Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• You can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
• Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Once you get the pop-up, just select "'Start in Safe Mode"

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the 解決擴充套件、佈景主題以及硬體加速造成的 Firefox 常見問題 article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

在安全模式中文字會顯示正常, 但我在一般情況下關掉其它的附屬程式還是沒有解決問題, 重灌跟回復原廠設定都沒辦法解決顯示問題的說...

Could you try disabling graphics hardware acceleration? Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.

You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.). Then perform these steps:

• Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
• In the Firefox options window click the Advanced tab, then select "General".
• In the settings list, you should find the Use hardware acceleration when available checkbox. Uncheck this checkbox.
• Now, restart Firefox and see if the problems persist.

Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:

解決擴充套件、佈景主題以及硬體加速造成的 Firefox 常見問題

升級顯示卡驅動程式以使用硬體加速與 WebGL

Did this fix your problems? Please report back to us!

Press "CTRL + 0" for Normal Mode.

• IF your using Themes in firefox, Remove it
• Make use of Default font size
• https://support.mozilla.org/en-US/kb/change-fonts-and-colors-websites-use
• https://addons.mozilla.org/en-us/firefox/addon/theme-font-size-changer/

多謝大大了~~~, 真的是"硬體加速的問題",

在工具>選項>進階>一般>瀏覽> 可用時開啟硬體加速(R) 將這欄取消就顯示正常了~~~

多謝大大的幫忙了~~~XD