Who maintains this site?
How does it work?
Why aren't Opera or IE available?
What are the graphs?
The top left-hand graph is Mozilla's Kraken benchmark. The top right-hand graph is Apple's SunSpider benchmark. The bottom graph is Google's V8 benchmark suite.
What do the hover tips mean?
"Source" is where we got the engine from. "Tested" is when we downloaded the engine, compiled, and tested it. "Rev" is the unique point in the engine's revision history we tested. If the datapoint represents a range, there may be multiple revs. These numbers/strings are for developers to see which changes happened in between points in the graph.
ARM is the CPU present in many embedded devices, like smartphones. We're interested in this for mobile Firefox and Firefox OS.
Is this open source?
Fo' sho', https://github.com/haytjes/arewefastyet