Roland's blog

Personally I am really disappointed with the bad support for the colorzilla issues with the firefox package. If you install the extension and use firefox as root... it works. As a regular user.. forget it.

Here's what you do. Download the firefox tar ball from getfirefox.com, then extract it to /opt or somewhere where you have access.

Do not extract it with root permissions.

Okay next remove /usr/bin/firefox which is just a soft link. (you know, sudo rm /usr/bin/firefox).

Next create a file: sudo vim /usr/bin/firefox

In the file enter:

cd /opt/firefox && ./firefox

Finally

sudo chmod 777 /opt/firefox

Okay you are good to go, but first you must remove your firefox profile in .mozilla/firefox. Backup your bookmarks and remove the whole directory .mozilla/firefox. Run firefox and install colorzilla. This will work!!

A crappy thing that you'd have to do once in a while is update firefox because dist-upgrade might force you to. Do not run the new installed firefox. This will break colorzilla. Instead, repeat the steps above after the upgrade and you should never have problems unless you use some program line netbeans that makes use of firefox.