Advice on DRYing this test up?

gistfile1.rb

shared_examples_for "Firefox browser" do
  it "should return 'Firefox' as its browser" do
    @useragent.browser.should == "Firefox"
  end

  it "should return :strong as its security" do
    @useragent.security.should == :strong
  end

  it { @useragent.should_not be_webkit }

end

describe 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b8) Gecko/20100101 Firefox/4.0b8' do
  before do
    @useragent = UserAgent.parse('Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b8) Gecko/20100101 Firefox/4.0b8')
  end

  it_should_behave_like "Firefox browser"

  it "should return '4.0b8' as its version" do
    @useragent.version.should == "4.0b8"
  end

  it "should return '20100101' as its gecko version" do
    @useragent.gecko.version.should == "20100101"
  end

  it "should return 'Macintosh' as its platform" do
    @useragent.platform.should == "Macintosh"
  end

  it "should return 'Intel Mac OS X 10.6' as its os" do
    @useragent.os.should == "Intel Mac OS X 10.6"
  end

  it "should return nil as its localization" do
    @useragent.localization.should be_nil
  end

  it { @useragent.should_not be_mobile }
end

describe 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13' do
  before do
    @useragent = UserAgent.parse('Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13')
  end

  it_should_behave_like "Firefox browser"

  it "should return '3.6.13' as its version" do
    @useragent.version.should == "3.6.13"
  end

  it "should return '20101203' as its gecko version" do
    @useragent.gecko.version.should == "20101203"
  end

  it "should return 'Macintosh' as its platform" do
    @useragent.platform.should == "Macintosh"
  end

  it "should return 'Intel Mac OS X 10.6' as its os" do
    @useragent.os.should == "Intel Mac OS X 10.6"
  end

  it "should return 'en-US' as its localization" do
    @useragent.localization.should == "en-US"
  end

  it { @useragent.should_not be_mobile }
end

I want to add like 40+ more test sections, but there's got to be a way to dry it up. Suggestions?

Original code here:

https://github.com/josh/useragent/blob/master/spec/browsers/gecko_user_agent_spec.rb