HAR Export Trigger

On November 14, with the launch of Firefox Quantum (AKA 57), support for old school extensions will stop in Firefox. It means that this extension will no longer work. New version of this extension built on top of WebExtensions API is available here: https://github.com/devtools-html/har-export-trigger

Firefox add-on improving automated HAR (HTTP Archive) export of collected data from the Network panel. This add-on is built on top of native developer tools in Firefox. Firebug is not needed for this add-on.

The add-on exports HAR API directly to the page. Any automated system can be consequently built on top of the API and trigger HAR export using a simple JavaScript call at any time. It can be also nicely integrated with e.g. Selenium to implement automated HAR export robots for existing automated test suites.

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License

HAR Export Trigger is free and open source software distributed under the BSD License.

Requirements

You need Firefox 42+ to run this extension.

Download

See the latest release

How To Use

This extension exposes HAR API into the content allowing pages to trigger HAR export as needed. To ensure that API is properly exposed into the page content you need to yet set the following preference in your Firefox profile (any string value that is passed into API calls):

extensions.netmonitor.har.contentAPIToken

To start automated collecting of HTTP data you need to set the following preference to true:

extensions.netmonitor.har.enableAutomation

You might also want to set the following preference to true, so the developer Toolbox doesn't have to be opened.

extensions.netmonitor.har.autoConnect

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An example script on your page can look like as follows:

var options = {
  token: "test",      // Value of the token in your preferences
  getData: true,      // True if you want to get HAR data as a string
};

HAR.triggerExport(options).then(result => {
  console.log(result.data);
});

• Check out a test page
• See more HAR API examples

Build & Run HAR Export Trigger

Following instructions describe how to build the extension from the source and run on your machine.

1. Install JPM: npm install jpm -g (read more about installing jpm)
2. Get the source: git clone https://github.com/firebug/har-export-trigger.git
3. Install required NPM modules: npm install
4. Run jpm run -b nightly in the source directory (learn more about jpm commands)

Further Resources

• Home Page: http://www.softwareishard.com/blog/har-export-trigger/
• HAR Spec: https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/HAR/Overview.html
• HAR Spec (original): http://www.softwareishard.com/blog/har-12-spec/
• HTTP Archive Viewer: http://www.softwareishard.com/blog/har-viewer/
• HAR Discussion Group: http://groups.google.com/group/http-archive-specification/