Firefox – Grey bar at the bottom !!!

Today morning when I opened my browser (Mozilla Firefox) it asked me to update a few add-on. I have updated the web developer tool bar and restarted firefox. When it opens there is a grey bar (about an inch and 1/2) at the bottom with a red arrow pointing upwards on the left side.
I assumed it should be an add-on conflict in firefox. So I have disabled the web developer add-on and restarted it. But it did not work.

Then I have updated all the updates and restarted it again!
So this is what I have done:

  • Clicked on Tools -> Add-ons -> Find Updates, after it has updated, I closed and re-opened firefox.

It worked!!! 🙂