Every time I open Firefox, or go to any page after opening Firefox there pops up an overlay screen which used to show an error message with a header that used to read something like "unable to read http://######. The only option the pop-up gave was to click on an "Okay" button or close the window by clicking on the "X" in the upper corner. The little pop-up window showed a "warning" triangle in yellow with just an exclamation point in the symbol and the only text in the pop-up was the number "2". I tried scanning / repairing / updating everything but it is still there. The only difference is that now when I open or go to a page the error pop-up no longer has a header bar or the triangle. It is just a white and gray box with the number "2" in it and an "okay" button.