Firebug, before FireFox 30.<p>Developer Tools (and the skin-of-developer-tools that is Firebug 2) are markedly inferior. From breakpoint- and file-management to the functional limitations and missing features around dom management... I miss the Firebug that died in FireFox 29.<p>...<p>Here&#x27;s what I&#x27;d like DevTools to do:<p>* Make a breakpoints view, not one embedded into a massive list of unsorted (or sorted-by-load-date I guess?!) files that changes over time. If that can&#x27;t be done (or is against the design philosophy of DevTools), letting me choose the sort order would be nice (e.g. recently-viewed files first, or files with breakpoints, etc ..... and uh, remembering those files and&#x2F;or settings through refreshes would be fantastic... I miss it from Firebug 2). It&#x27;s nice because after&#x2F;during refreshes the breakpoint view lets you pull up the file the second it&#x27;s loaded, instead of scrolling around in the file list until you find it.<p>* Make it a LOT more obvious when DevTools is stopped at a breakpoint.<p>* DevTools doesn&#x27;t handle initial focus the way Firebug does. As in, when you pull up Firebug via the selection icon--oh, DevTools needs that selection icon for the toolbar--it goes straight to the dom node you selected.<p>* Make DevTools stop crashing. It stops working. Constantly. The console will just stop printing output, and the DOM view just stops displaying HTML, requiring a browser restart. (When this happens, if you, say, pull up the console and type &quot;1&quot; and hit enter, usually the console echos &quot;1&quot; back to you. When you&#x27;re in this state, it&#x27;s not echoed back, though, oddly, some script messages still pop in.)<p>* Make &quot;debugger&quot; start working again. There are some places where--for who knows what reason--both Firebug and DevTools have ignored breakpoints I&#x27;ve put in, and I&#x27;ve been able to get around it in Firebug by explicitly putting in &quot;debugger;&quot; into my code. You definitely know you&#x27;re in deep kimchi when you need &quot;debugger;&quot;.<p>Also, for one of my websites, it can&#x27;t load the source. It just shows &quot;eval&quot; as the filenames over and over with nothing in them. Firebug 2 loads it just fine.<p>If I use the browser too long, the Inspector and Console tabs go blank.<p>Oh, and DevTools often doesn&#x27;t honor my breakpoints. They &quot;slide&quot; down to the next line DevTools thinks it can actually stop on. Sometimes, once I restart my browser they&#x27;ll work again.<p>For another, as a time-saver I put breakpoints on lines that &#x2F;will&#x2F; be valid when I refresh (saves me from having to refresh the file twice), so it&#x27;d be grand if it simply honored the line i clicked rather than &quot;sliding&quot; down to the next valid one.