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To see anything, you need to set the pref browser.dom.window.dump.enabled to true, e.g. Content is available under these licenses. Similarly, you can execute JavaScript expressions using the Browser Console. console.debug(...) Deprecated, you should use console.log() instead.

Try running this code in the Browser Console's command line (remember that to send multiple lines to the Browser Console, use Shift+Enter): var newTabBrowser = gBrowser.getBrowserForTab(gBrowser.selectedTab); newTabBrowser.addEventListener("load", function() {   newTabBrowser.contentDocument.body.innerHTML By logging reflow events the Web Console can give you insight into when reflow events are being triggered, how long they take to execute and, if the reflows are synchronous reflows I know that I there's Firebug, which provides a console object and its own error console, but I was looking for a quick fix earlier on and couldn't find anything. Timing and profiling Firebug gives you two easy ways to measure JavaScript performance.

Content is available under these licenses. If you're developing your add-on using the Extension Auto-installer, then the add-on is installed in Firefox, meaning that messages will appear in the Browser Console. But if you are interested in how extensions in firefox interact with the error console. To enable it set the devtools.chrome.enabled preference to true in about:config, or set the "Enable chrome debugging" option in the developer tool settings.

Method The specific HTTP request method. Console.log() For general output of logging information. Be assertive Assertions are a wonderful way to ensure that your code stays rock-solid in the face of change. This enables you to use the Web Console to debug server-side code.

Because reflows can be computationally expensive and directly affect the user interface, they can have a big impact on the responsiveness of a website or web app. Note: This feature is available in Web Workers. share|improve this answer edited Apr 23 '09 at 22:52 answered Apr 23 '09 at 22:00 Brian Campbell 163k37260291 I'm not against installing Firebug (which I have by now), I Object inspection How many times have you hand-written code to dump all of the properties of an object, or all of the elements in an HTML fragment?

Use the filtering feature to show them. This is not shown by default: you can opt to see timestamps using a setting in the Toolbox. Firebug will log a detailed report about how much time was spent in every function call in between. You can see the resulting profile in the browser's performance tool (for example, the Firefox performance tool).

Why are unsigned numbers implemented? Clicking the main part of the button toggles that category on or off, while clicking the arrow on the right gives you more fine-grained filter options within that category: Net Errors Especially when debug logging shows up in a production environment, the noise can make it harder, not easier, to debug issues. Stack traces The console object also supports outputting a stack trace; this will show you the call path taken to reach the point at which you call console.trace().

Outputting a single object The simplest way to use the logging methods is to output a single object: var someObject = { str: "Some text", id: 5 }; console.log(someObject); The output However, Firefox 4 has a new Tools > Web Console, and if this is open you have a window.console object and untrusted JavaScript code on the page can use console.log(). Available in workers ? 38.0 (38.0) ? ? ? [1] If a negative value is passed to %d, it will be rounded down to the closest negative integer, so -0.1 becomes msg A JavaScript string containing zero or more substitution strings.  subst1 ...

assist. Password fields present on an insecure (http://) iframe. If you also want to use the other web developer tools in the regular Web Toolbox with add-on or browser code, consider using the Browser Toolbox. Firebug provides a set of handy assertion functions, and writes very informative error messages to the console when your assertions fail.

Browser Console logging The Browser console logs the same sorts of messages as the Web Console: HTTP requests Warnings and errors (including JavaScript, CSS, security warnings and errors, and messages explicitly Number of occurrences If a line that generates a warning or error is executed more than once, it is only logged once and this counter appears to indicate how many times The browser blocked this display content. Syntax console.log(obj1 [, obj2, ..., objN]); console.log(msg [, subst1, ..., substN]); Parameters obj1 ...

Console.groupCollapsed() Creates a new inline group, indenting all following output by another level; unlike group(), this starts with the inline group collapsed, requiring the use of a disclosure button to expand Is this good practice. iframes containing login forms must be served over HTTPS, not HTTP. We see we can not only access the Browser Console but also Web Console.

Note: It's important to note that if you're using this to log the timing for network traffic, the timer will report the total time for the transaction, while the time listed This site specified both an X-Content-Security-Policy/Report-Only header and a Content-Security-Policy/Report-Only header. Specifications Specification Status Comment Console APIThe definition of 'console.log()' in that specification. Prior to Gecko 12.0, the console object's methods only work when the Web Console is open.

This means that if your JavaScript sources are compressed, you can supply a source map for them. CSS CSS warnings and reflow messages are not shown by default. Note: This feature is available in Web Workers. You can specify an optional name for the profile.

Why is the spacesuit design so strange in Sunshine? extensions.extensionID.sdk.console.logLevel, where extensionID is an add-on's Program ID.