Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do not click the Reset button on the Safe mode start window or otherwise make changes.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"

• https://hacks.mozilla.org/2010/09/hardware-acceleration/

Hello, thanks for your reply. I tried it without addons and themes, but it hasn´t helped. Also disabling Hardware acceleration is not helping.

Thanks in advance, Simon

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Use a compressed image type like PNG or JPG to save the screenshot.

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that works.

Try a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.

• C:\Program Files\Mozilla Firefox\
• http://kb.mozillazine.org/Installation_directory

Download a fresh Firefox copy and save the file to the desktop.

• Firefox 15.0.x: http://www.mozilla.org/en-US/firefox/all.html

Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.

• Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

• It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
• http://kb.mozillazine.org/Uninstalling_Firefox

Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.

If you keep having problems then also create a new profile.

• http://kb.mozillazine.org/Profile_folder_-_Firefox
• http://kb.mozillazine.org/Profile_backup

• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Hello, I already tried reinstalling.. But it hasn´t helped. I also deleted my complete Profile.. No effect :(

Here is a screenshot of the problem. Hope this helps.

Simon

Finally fixed this problem. I created a userChrome.css in my profile and entered the css for smaller tab bars. This made them small again :)

@lapayo, it would've been nice if you posted your css you created. Now I had to reinvent the wheel, so to say.

Anyway, to use this solution, locate the your FireFox profiles folder: %APPDATA%\Mozilla\Firefox\Profiles\ (you can copy&paste this directly into your file explorer's location bar to locate the folder). Here, open your default profile folder (xxxxxxxx.default) . Create a folder named "chrome" in your profile folder (if it doesn't exist already). In the chrome folder, create a text file named "userChrome.css". Edit this file and add the css code in it. The css code that works for me is:

/* Shrink tab height (it is weirdly high in Windows 8)*/

.tabbrowser-tab {

height: 30px !important;

min-height: 30px !important;

max-height: 30px !important;

}

You can experiment with the heigth in pixels to get the best result for you. For me 30px did the trick (but I have a high-res screen, so I set the magnification factor in Windows to 125%, so you might need a different value than 30px).

I found this code here: https://getsatisfaction.com/flock/topics/shorten_tab_height

I found a solution to this problem without messing with settings in windows:

in about:config set gestures.enable_single_finger_input to false

This fixed the problem for me; tabs are back to normal and sites no longer direct me to tablet sites on occasion

The solution in the below link would work in theory too if one can get windows to stop reporting touch input, but I stopped the service like they suggested with no success; only the about:config method got me the results I wanted. https://support.mozilla.org/en-US/questions/941577#answer-404064

I have this problem also and I haven't found a way to fix it. I have tried everything that has been posted except the one that says in about:, how do you get to where it says about?

Found it but says don't mess with unless you know what you are doing. I don't understand any of this configure stuff so I am stuck.

@kalija, it really isn't that difficult in this particular case. You can acknowledge the warning, find the setting (by copy & pasting gestures.enable_single_finger_input in the search field; one line should remain), and then it is just a matter of double clicking that line to change it from true to false. This can always be reversed by double clicking it again, or by right-clicking and choosing "Reset" from the pop-up menu.