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capybara-firebug provides a dead-simple way to run scenarios with Firebug enabled under the selenium driver.

  1. Install the gem
  2. require 'capybara/firebug' in env.rb
  3. Tag a scenario with @firebug
  4. Run it

Firebug will be set up so that all features are fully enabled on every page.

You'll want to be able to pause the scenario at some point to inspect things in Firebug. A step definition for Then stop and let me debug is provided for this purpose. When executed, it breaks in the Ruby debugger.

Using Firefox 4 and Firebug 1.7.0

If you want to use Firefox 4 with Firebug 1.7.0, configure the firebug_version setting in your capybara.rb support file

# located in features/support/capybara.rb or similar
require 'capybara/firebug'
Selenium::WebDriver::Firefox::Profile.firebug_version = '1.7.0'

Customizing the Profile

If you wish to further customize the Firefox profile used by selenium, you can use the #enable_firebug method to add the Firebug extension to it:

profile =

This can also be used to enable Firebug on a remote browser:,
   :browser => :remote,
   :url => "http://my.ip.add.ress:4444/wd/hub",
   :desired_capabilities => Selenium::WebDriver::Remote::Capabilities.firefox(:firefox_profile => profile))