Software is hard

See a summary of short tips concerning specific Firebug features that do not get such attention they might deserve.

Debugging

• Conditional Breakpoints
  How to break on a breakpoint only if certain condition is true.
• Debugging XML
  XML related features available in Firebug.
• Break on HTML Mutation How to quickly find the line of code that is causing HTML changes.
• Modify variable value at runtime
  Modify variable value and continue debugging.
• Re-run this stack
  How to re-execute the current call-stack in the debugger.
• Type to pick a script file quickly
  How to quickly find specific script file in the Script panel
• Disable debugger; keyword
  Properly deal with the debugger; keyword.
• sourceURL directive
  Label dynamic scripts with ‘sourceURL’ directive

Console

• Styled Logging
  Read about how to use custom CSS for console logs.
• Observe window.postMessage() calls
  Check out this post to learn about how to observe messages posted among iframes.
• Log Function Calls
  How to check out that a function has been actually executed.
• Log DOM Events
  How to log DOM events into the Console panel.
• Using Command Line within an iframe
  How to execute command line expressions within context of an iframe.
• Tabular logs
  Learn how to log tabular data into the Console panel.
• include() command
  How to quickly include command into the current page
• getEventListeners() command
  Get list of registered listeners for given an element.

HTML & CSS

• Copy & Paste HTML
  Learn how to use HTML clipboard in Firebug
• Trace Styles
  Find all places in CSS style-sheet that affect specific CSS property.
• What font-family is rendered
  Identify the rendered font-family from the list of font-families for a CSS 'font' or 'font-family' property.
• Inspector History & Command Line
  History of inspected elements on Firebug's command line.

Network

• Show BFCache Responses
  Read this post to understand how BFCache cache is different from the standard browser cache and why Firebug supports it.
• Observe page redirects
  How to track HTTP requests that happened in previous page load.
• Resend HTTP Request
  How to resend an existing HTTP request while preserving headers, post data, etc.

Miscellaneous

• The Start Button
  See what is Firebug Start Button and what features it supports.
• Alternative Firebug Themes
  Learn how to create your own Firebug theme.