Hello,
Posting solution so that it helps others.
To turn off spell checking in IE10
Tools, Manage addons, left side
remove the tick next to "enable Spell checking"
close/save
For Firefox
Tools, options, advanced tab,browsing,
remove the tick from "check my spelling"
OK
For Google chrome
Gear, settings, show advanced settings, language & spell checker settings
Remove the tick from "enable spell checking"
OK