I'm curious about the small dips you can see in the long term view of Firefox's browser share. They all seem to match up exactly with a bump in one of the othe

I'm curious about the small dips you can see in the long term view of Firefox's browser share. They all seem to match up exactly with a bump in one of the other browsers' share (mostly IE or Chrome). Is this because Firefox users are prone to temporarily switch to another browser and back again whenever a new version is released?