[fix bug 1449743] Firstrun iframe is off center
[fix bug 1449743] Firstrun iframe is off center

ericawright/bedrock,pascalchevrel/bedrock,hoosteeno/bedrock,kyoshino/bedrock,MichaelKohler/bedrock,alexgibson/bedrock,ericawright/bedrock,kyoshino/bedrock,sgarrity/bedrock,mozilla/bedrock,alexgibson/bedrock,flodolo/bedrock,MichaelKohler/bedrock,MichaelKohler/bedrock,pascalchevrel/bedrock,sylvestre/bedrock,sgarrity/bedrock,craigcook/bedrock,hoosteeno/bedrock,hoosteeno/bedrock,craigcook/bedrock,flodolo/bedrock,MichaelKohler/bedrock,sgarrity/bedrock,sgarrity/bedrock,mozilla/bedrock,craigcook/bedrock,alexgibson/bedrock,kyoshino/bedrock,ericawright/bedrock,flodolo/bedrock,alexgibson/bedrock,craigcook/bedrock,pascalchevrel/bedrock,ericawright/bedrock,mozilla/bedrock,sylvestre/bedrock,sylvestre/bedrock,sylvestre/bedrock,pascalchevrel/bedrock,hoosteeno/bedrock,flodolo/bedrock,kyoshino/bedrock,mozilla/bedrock