help with sticking cusor in mail?

when i write mail and i get ready to send it i go to the first misspelled word and correct it. then i use the right arrow to move to the next word and check structure along the way. but the cursor sticks and jumps, sometimes complete lines and sentences. anyone have a fix. i use firefox as my browser but i use it on 4 computers and this is the only one that does this. it did not do in this mail. thanks

2014-01-19T07:47:38Z

this problem is not the touch pad tapping that was answered. it is only in the email reply text box. i have the touch pad disabled. and i don't even have that feature in my mouse properties. thanks for the help

Anonymous2014-01-19T04:33:07Z

Favorite Answer

http://voices.yahoo.com/how-disable-tapping-fix-jumping-cursor-problem-7340294.html?cat=59
see if this information can help you.