I got pandaboard to improve ARM code on Firefox. Pandaboard uses TI OMAP4 (Dual-core Cortex-A9 and PowerVR SGX 540), so it is the most powerful ARM board.
This data is sunspider benchmark on Firefox 4 on pandaboard. BTW, my Android phone (HTC Desire HD) is 2800ms.
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RESULTS (means and 95% confidence intervals)
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Total: 1984.1ms +/- 0.7%
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3d: 354.2ms +/- 1.3%
cube: 139.8ms +/- 2.0%
morph: 65.2ms +/- 5.1%
raytrace: 149.2ms +/- 3.5%
access: 290.7ms +/- 2.5%
binary-trees: 47.1ms +/- 3.5%
fannkuch: 116.6ms +/- 6.9%
nbody: 47.1ms +/- 6.9%
nsieve: 79.9ms +/- 2.0%
bitops: 105.1ms +/- 1.8%
3bit-bits-in-byte: 5.1ms +/- 8.0%
bits-in-byte: 50.4ms +/- 1.2%
bitwise-and: 12.3ms +/- 5.5%
nsieve-bits: 37.3ms +/- 2.9%
controlflow: 21.5ms +/- 7.2%
recursive: 21.5ms +/- 7.2%
crypto: 181.5ms +/- 1.9%
aes: 94.5ms +/- 0.8%
md5: 51.8ms +/- 4.7%
sha1: 35.2ms +/- 5.2%
date: 279.9ms +/- 1.9%
format-tofte: 173.9ms +/- 2.6%
format-xparb: 106.0ms +/- 2.9%
math: 144.1ms +/- 1.2%
cordic: 39.7ms +/- 1.5%
partial-sums: 47.5ms +/- 2.3%
spectral-norm: 56.9ms +/- 1.7%
regexp: 123.1ms +/- 3.9%
dna: 123.1ms +/- 3.9%
string: 484.0ms +/- 1.0%
base64: 44.3ms +/- 3.3%
fasta: 96.4ms +/- 3.1%
tagcloud: 146.4ms +/- 1.5%
unpack-code: 135.5ms +/- 1.7%
validate-input: 61.4ms +/- 3.2%
Although I have already landed ARM optimized NSS code (for crypto) into cvs.mozilla.org, it won't used by Firefox 4 or 5. It is for NSS trunk (NSS version 4). But I am investigate ARM specific optimization for Firefox 5.