Beautify Firefox buttons in Linux

In Linux, the Form Control displayed in Firefox of Linux is ugly, especially the single-choice button glitch and abrupt button style. This solution was proposed by ubuntuforums.org, they used the new CSS to overwrite the original form CSS. first download the patch file: Open the terminal command prompt and enter the following command:
Wget http://users.tkk.fi /~ Otsaloma/art/firefox-form-widgets.tar.gz

Decompress the package and check the install file:
First, find the res directory in your Firefox folder.
Add the content in the downloaded forms-extra.css file to the back of the forms.css file.
Copy the form-widgets folder to the res directory.
Restart Firefox

Generally, the Firefox folder is under "/usr/share/Firefox" or "/usr/share/iceweasel" In Debian"