Purple Highlighted Text

So i was surfing on youtube for a soundtrack.For some reason,all the text on youtube turns purple and i used the back button which returns to google,the text was all purple.This happened only once,so i was wondering,is it due to my graphic card overheating again?I have changed my graphic card once before due to overheating and I absolutely HATE to buy another one again.I spend way too much on graphic cards and I just bought this new one not too long ago.Sorry I didnt happen to get a screenshot.My first graphic card was gtx560 and it overheated before i had to change to the gtx650 cause i didnt have much money.I bought my gtx650 last december.

No i didnt change the fan speed recently.I used to change my fan speed to 40-50% using thundermaster and then i realise that the graphic card can do a better job of changing my fan speed as and when it requires to,I am currently playing a lot of World of Tanks by the way,on minimum graphics though,I can't afford another overheated graphic card since my computer is only like close to 2years old,which is pretty new.