Comment 15 for bug 1063453

You're not required to defend others' trademarks. You are under no legal obligation to accompany trademark names with Ⓡ or ™ (for registered and unregistered trademarks, respectively). Because the symbols reduce the readability of the text, I'd recommend avoiding their use.

In addition, while some companies encourage the use of both the proper and generic term in reference to their products ("Google search engine" instead of "Google") and discourage turning product names into verbs, these restrictions are not legally binding.

As long as you use "Google" to refer to the company or search engine named "Google" and not, say, Yahoo or Bing, you shouldn't encounter any problems.