cmd/pprof: weblist command does not work in firefox

[ALTree]

Steps to reproduce

1. Go here: http://benchgraffiti.googlecode.com/hg/havlak/havlak1.html
2. click on one line of code

What should happen (and happens, in chrome)

the disassembly of that line appear on the screen

What happens (when you use firefox)

the disassembly of that line does not appear on the screen.

I reproduced this on tip. I suspect that weblist never actually worked in firefox.

The firefox developer console throws a

TypeError: e is undefined

in the html file generated by the weblist command every time you click a line of code.

[gopherbot]

CL https://golang.org/cl/21802 mentions this issue.