Why is there a small micro sized window every time I boot FireFox?

Question

The window always appears right after I boot Firefox for the first time(since the last system reboot) and is always in a small Nearly minimized state (in window mode at the smallest setting.)

The page appears to be blank and the source is blank as well. Could it be the work of a malicious script/code or is it just one of the few quirks of Firefox?

Answer 1

Newer versions of firefox sometimes try to reload pages and tabs from previous sessions - I have seen this before and it's probably got something to do with the website you were on at some point rather than a specific problem with firefox. Open firefox then minimise the largest page which opens. Find the small one and try resizing it to a larger size. Then close it. Open firefox again and see if its gone. Failing that try emptying your cache and web history.

It's unlikely to be anything malicious, but just in case, do a virus scan anyway.