YouTip

# Debugging JavaScript with Firebug * * * > The official Firebug website has announced the discontinuation of development, updates, and maintenance for Firebug, inviting everyone to use Firefox's built-in tool (https://developer.mozilla.org/en-US/docs/Tools). ## Description Firebug is a very powerful tool that can help you find errors in your code and resolve them. Here, we use Firebug to handle JavaScript code. First, we need to load the page and open Firebug. Sometimes you may need to reload the page. ## Error Count in the Status Bar  ## Display Errors for the Current Page  ## Display Detailed Error Information  ## Step-by-Step Code Debugging ### You can execute code step by step. This is very useful for debugging.  ### Debugging with Breakpoints Breakpoint debugging can halt the execution of code, allowing you to check if an error occurs within a specified code range by setting breakpoints. This is very useful for error debugging. If you click the "Step over" button, Firebug will update all variables until you terminate the breakpoint execution in the right window.  ### Using Expressions with Breakpoints You can write an expression, and the breakpoint will stop code execution when the condition is true.  ### Search You can use the quick search to find keywords in the code.