[Bug 109943]

[Mkmelin+mozilla]

xul:progressmeter was converted to html:progress. But looks like it's still reproducible at least on linux. 
In scratchpad or console, do 

document.getElementById("tabmail-
container").appendChild(document.createElementNS("http://www.w3.org/1999/xhtml",
"progress"));

... and check CPU usage. For me it goes to around 20% and stays there.

Can also reproduce on Firefox nightly. There in the Developer Tools |
Console

document.getElementById("urlbar").appendChild(document.createElementNS("http://www.w3.org/1999/xhtml",
"progress"));

The only difference is that there it jumps from listing Firefox to "GPU
process" and back. It's still Firefox causing it.

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https://bugs.launchpad.net/bugs/109943

Title:
  Thunderbird: high CPU usage from progress bars

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