I have been doing that too. Would like to see any advice on that. I am temporarily avoiding FF29 until I figure out how to customize it the way it used to work; my workflow is significantly slowed in adjusting to the new layout that is forced on me. So that means deleting the update in the profiles folder each time I start FF, as it says it will apply the update the next time I restart the program. Thinking of trying Pale Moon.

Go to Mozilla.org, and download the full installer.

Uninstall Firefox from your computer {web link}

Instill Old Versions Of Firefox {web link}