Most sites that don't work without javascript are unpleasant to use with it enabled anyway. Also some portion of those 0.9% might be running librejs or noscrip

Most sites that don't work without javascript are unpleasant to use with it enabled anyway. Also some portion of those 0.9% might be running librejs or noscript which has the user review each script file before running it and is much more aggressive about blocking cross site requests. With "disable js" removed from the firefox GUI a lot of the people "blocking javascript" probably show up as "errors." I use this. The main reason is performance, my thinkpad is unusable if I let everyone's crap run wild on it. Also evaling every snippet of code you get over the network is absolute brain damage from a security perspective but no one actually cares anymore.