My conspiracy theory for the Day

Ok so this may sound nuts to some people. The browser company Firefox came out with its brand new version 4.0 a short time ago. They boast speed boosts, a cleaner engine, and more support for HTML 5. This may be true, but here is where my conspiracy theory comes in. Did they purposely slow down the old browser so people switch to the new version. Some may say this is crazy. Think about it though. You want to boost your popularity and get in the news so you want your new version to explode in number of downloads. You have to do this as soon as possible, because less and less people pay attention after the initial month. (Well until they say UPDATE YOUR BROWSER NOW OR I AM GOING TO CUT OFF YOUR WANKER, after-all it is over 1 year old which is ancient in computer terms). So would I be that far off my rocker, am I tipping the rocker over with my craziness or do you think this is possible.? I know my version has slowed down at least 20%. How much has yours slowed...(if your still using IE8 or lower your retarded)