Actually Mali GPU does not support OES_texture_float. For example, you can not open this webgl websitehttp://madebyevan.com/webgl-water/
How we resolve this issue?
Please also note that WebGL is based off of OpenGL ES 2.0
As such, and considering we do not support the OES_texture_float extension, any WebGL content relying on that extension will not work on Mali GPUs.
I hope that helps clarify things further.
Kind Regards,
Michael McGeagh