This is sort of tangential to coding, but programmers often do \"view source\" on their own pages and on others\' pages. I learned that when you do the normal View Source in
From Firefox 42.0 onwards, clicking "View source" should not do a new GET request but use the cache:
Importantly, we have also ensured that View Page Source provides you with the source of the page as-is from Firefox’s cache – we do not fetch a new version.
Reference: https://hacks.mozilla.org/2015/07/developer-edition-41-view-source-in-a-tab-screenshot-elements-har-files-and-more/