The 'Logitech, Inc. QuickCam Express' webcam is not full supported in Linux.
For it to work in Firefox and Chrome browsers a library (v4l1compat.so) preload is needed.
The Command to find out if you have a Logitech QE webcam is lsusb and the device ID would be 046d:092f.
For Firefox the command line or script would be like this.
LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libv4l/v4l1compat.so firefox
For Google Chrome.
LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libv4l/v4l1compat.so google-chrome