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.

Firefox runs at 640 x 480. How do I get it to normal? This is my 4th install.

  • 3 replies
  • 2 have this problem
  • 19 views
  • Last reply by deebeefc

deebeefc
deebeefc
more options

Firefox won't run at the system's standard video setting. It is locked into 640 x 480. I have removed it from the system, and have tried to install new versions for the past 4 years. They all come on at 640 x 480, and while Firefox is running, everything else on my system runs at 640 x 480. I am about to uninstall it again.

Firefox won't run at the system's standard video setting. It is locked into 640 x 480. I have removed it from the system, and have tried to install new versions for the past 4 years. They all come on at 640 x 480, and while Firefox is running, everything else on my system runs at 640 x 480. I am about to uninstall it again.

Chosen solution

Check that you do not run Firefox in compatibility mode or with a reduced screen resolution.

You can open the Properties of the Firefox desktop shortcut via the right-click context menu and check the "Compatibility" tab.
Make sure that all items are deselected in the "Compatibility" tab of the Properties window.

Read this answer in context 👍 1

All Replies (3)

andy_licious
andy_licious
more options

Hello,

Firefox on Windows is now following display scaling options which may render text larger on high resolution displays. There's more than one way to resolve this problem. See the Webpages are large and blurry after updating Firefox - how to fix article for one suggestion. Here's another possible solution:

  • Type about:config into the Firefox address bar and tap on the Enter key.
  • If the warning This might void your warranty appears, click I'll be careful, I promise.
  • Search for layout.css.devPixelsPerPx

Fx22layout.css.devPixelsPerPx

  • Double-click on layout.css.devPixelsPerPx to modify its value. The default is -1.0 in Firefox 22 and above. Change it to 1.0 to make it work like in previous Firefox versions.

If necessary, further adjust the value in 0.1 or 0.05 steps. Use values between 1.0 and about 0.5 to reduce elements in size. Use values greater than 1.0 to increase size. For example, a value of 1.25 will increase font size to 125% to accommodate the default DPI setting in Windows 8. Double check the value that you enter. Setting a too small value will make everything disappear and a too large value will blow things up.

If web pages still need to be adjusted then you can look at the Default FullZoom Level or NoSquint extension.

To adjust the font size for the user interface, you can use the Theme Font & Size Changer extension.

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

Cheers!

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Chosen Solution

Check that you do not run Firefox in compatibility mode or with a reduced screen resolution.

You can open the Properties of the Firefox desktop shortcut via the right-click context menu and check the "Compatibility" tab.
Make sure that all items are deselected in the "Compatibility" tab of the Properties window.

deebeefc
deebeefc Question owner
more options

While in the Compatibility tab", after deselecting the items in the Compatibility tab, click "Run this program as an administrator", then click "Show settings for all users" and deselect all the items again. Click "okay" two times. There were checked items in the "settings for all users".

This worked fine and now I can use Firefox again. Thank you, Thank you, Thank you!