it's not ad blocker. i use it and have no such issue. it may show issues however, if you start combining multiple blockers. more likely something vital gets blocked besides the ads. i have tinkered a ton with a firefox install and caused a ton of issues for myself all over the web. could never figure it out since i had done so many things. ended up starting over on it.
try just ad-block if you wish and if the problem is gone, then add one more add-on back and so on until you see an issue,. will show you what the problem is and what to avoid using in combo.