Another Reason To Love Mozilla
5th November 2003 · Last updated: 5th October 2016
I just noticed how you can highlight part of a web page in Mozilla 1.5 on Windows, right-click and choose View Selection Source. This pops up a window with the actual code used to make the highlighted area! If your highlight covers more than one set of tags, you get the whole source code, with the relevant lines highlighted. Otherwise a single line of code is shown.
What a fantastic idea! Rather than wading through a whole file to see how something was coded on a web page, use this method to see only the part you need. Try it on the headings here.