Install Firebug for Capybara

capybara-firebug.rb

# UPDATE: You are probably better off using jfirebaugh's gem.
# See https://github.com/jfirebaugh/capybara-firebug

# Set up Capybara to install Firebug in the default session.
#
# Download firebug.xpi from http://getfirebug.com/downloads and check it in.
# Set FirebugFix::ORIGINAL_XPI_PATH to its location.

require 'selenium/webdriver'

class FirebugFix
  ORIGINAL_XPI_PATH = File.join(Rails.root, "features/support/firebug.xpi")

  # Rejigger Firebug so the welcome page doesn't come up on launch
  #
  def self.generate_patched_xpi
    tmp_name = "firebugfix-#{Time.now.utc.to_f}"
    tmp_dir = "/tmp/#{tmp_name}"
    xpi_path = "/tmp/#{tmp_name}.xpi"
    script = <<-END
      mkdir #{tmp_dir}
      cd #{tmp_dir}
      unzip '#{ORIGINAL_XPI_PATH}'
      sed -i '' -e 's/currentVersion", ""/currentVersion", "99"/' defaults/preferences/firebug.js
      zip -r #{xpi_path} *
    END
    `#{script}`
    raise "Failed to generate firebug.xpi" if $? != 0
    xpi_path
  end
end

Capybara.register_driver :selenium do |app|
  patched_xpi = FirebugFix.generate_patched_xpi
  
  profile = Selenium::WebDriver::Firefox::Profile.new
  profile.add_extension patched_xpi
  Capybara::Driver::Selenium.new app, :profile => profile
end

# This code is dedicated to the public domain using a CC0 license.
# http://creativecommons.org/publicdomain/zero/1.0/

Thanks for this. I figured out how to set up the profile in a way that doesn't require repackaging firebug, and released it as a gem: https://github.com/jfirebaugh/capybara-firebug

Thanks John! I've switched to your gem and it's working fine.