I have noticed that some browsers (in particular, Firefox and Opera) are very zealous in using cached copies of .css and .js files, even be
For my development, I find that chrome has a great solution.
https://developer.chrome.com/devtools/docs/tips-and-tricks#hard-reload
With developer tools open, simply long click the refresh button and let go once you hover over "Empty Cache and Hard Reload".
This is my best friend, and is a super light weight way to get what you want!