I'm using Firefox 38.0 on Ubuntu 14.04.
In the last week I'm getting some strange symptoms on some but not all sites. If I open a new tab the title and the loading icon (the circular arrow) oscillate on and off for about a second or so before the page loads. I would guess at over ten times in one second. I have never seen this occur before. I may be being paranoid but I'm wondering if my DNS queries are being intercepted.
What would be the best way to monitor my network connections?