- Tired of annoying mesage "It looks like you haven't started Firefox in a while. Do you want to clean it up for a fresh, like-new experience? And by the way, welcome back!"
Solution found at http://miroslav.suchy.cz/blog/archives/2014/05/13/how_to_disable_reset_prompt_in_firefox/index.html
- step by step:
Open: about:config
Create a new entry by selecting any entry > right mouse click > New > Boolean
Enter the preference name: browser.disableResetPrompt
Value: True