Hi So that this can be looked into further: # Open Firefox # Open a new tab and type in “about:logging” into the URL bar. # Set the "Logging preset" to "Networking" # Select "Logging to a file" and note the path to the log file. # Click on "Start Logging". # Reproduce the issue (i.e. go to the web site that is broken for you and make the bug happen in the browser) # Click on "Stop Logging". # Provide the link or dump files to the Firefox developers via email to necko@mozilla.com Thank you for your help. it would also be good to know if you are using Adblocker Ultimate in Firefox.