1  # Stop & backup
   2  xm stop sandbox
   3  cp -a sandbox/ sandbox.bk
   4  
   5  # Verify MD5 sum
   6  md5sum sandbox/disk.img 
   7  4976347006df34843d29c939b5fc3742  sandbox/disk.img
   8  md5sum sandbox.bk/disk.img 
   9  4976347006df34843d29c939b5fc3742  sandbox.bk/disk.img
  10  
  11  # Create a 5Gb temp file
  12  dd if=/dev/zero of=Tempfile bs=1024 count=5000000
  13  
  14  # Append it to the existing image
  15  cat Tempfile >> disk.img
  16  rm Tempfile
  17  
  18  # Resize the partition
  19  resize2fs -f disk.img
  20  
  21  # Check partition & start domU
  22  fsck.ext3 disk.img
  23  xm create -c sandbox.cfg

There is absolutely not a single developer in the world who knows what size I like my browser, although many people think they do. To prevent resizing of FF make the following steps.

1. Open browser preferences
2. Choose “Content”
3. Choose “Advanced” on the “Enable javascript” preference
4. Untick “Move or resize existing windows”