Did Microsoft use the "Firefox' keyword on Twitter to promote IE9?

This is interesting ... searches on Twitter for the term 'Firefox' were pointing to a 'Promoted Tweet' featuring IE9. Did Microsoft purchase the 'Firefox' keyword on Twitter to promote its own browser or was it just a happy accident for Microsoft?

This is interesting ... searches on Twitter for the term 'Firefox' were pointing to a 'Promoted Tweet' featuring IE9. Did Microsoft purchase the 'Firefox' keyword on Twitter to promote its own browser or was it just a happy accident for Microsoft?

Here's the link (the IE9 'Promoted tweet' is no longer being displayed).

This was spotted by Paul Roget, Mozilla Tech Evangalist who pulled up the Redmond giant, calling on the company not to be 'lame'.

Sneaky tactic or clever tactic or just a happy accident that just happened to benefit Microsoft? Does it matter if a competitor does this? Does anyone even pay attention to 'Promoted Tweets'?

I've reached out to Microsoft for comment and will update the post if/when I receive a statement.