Overwritten rule, inspector's tab, filter in the tab for the status, console splitted, filters in the css tabs, window position, meta button event/scroll/flex in inspector, 3 tabs view, inactive css, highlight on click, simulate print style
Debugger search inside file and breakpoint
Network panel, optimize performance, filters for files, throttling, view of single request, edit request and resend
Shortcut
Responsive view, custom device, throttling, user agent, screen, user agent
Remote debugging with all the browser device with gecko, list of extensions
Accessibility tool with section read by screen readers, audits
Overwritten rule, inspector's tab, filter in the tab for the status, console splitted, filters in the css tabs, window position, meta button event/scroll/flex in inspector, 3 tabs view, inactive css, highlight on click, simulate print style
Debugger search inside file and breakpoint
Network panel, optimize performance, filters for files, throttling, view of single request, edit request and resend
Shortcut
Responsive view, custom device, throttling, user agent, screen, user agent
Remote debugging with all the browser device with gecko, list of extensions
Accessibility tool with section read by screen readers, audits
flexbox/grid inspector, fonts editor (font variation)
css changes, copy
debugger logpoints, dom breakpoint changes, event breakpoints, watchpoints (property)
Console search, multiline editor
HAR files
webhint extension, webcompat
https://medium.com/@lakatos/30-tips-tricks-with-the-firefox-developer-tools-2e3f2ca5bc61