First, (as I understood) you indicated that the market share decline and the layoffs were somehow related. Given that the graph started in 2009, 1 year after Chrome was first released and only the last datapoint is after the date, I don't think they're related at all. We all know that Chrome captured the IE/Firefox market share in the whole last decade and that's what the graph's showing.

Second, your concept of rapid decline clearly differs from mine. That is an eleven year decline and I don't think it's "rapid" at all for a browser.