Unwanted startup page on Firefox keeps on coming back

I recently watched this video:

And now every time I open my browser, it is one of my startup pages (although not replacing any of the existing), I have looked in my settings and it is not marked as a startup page. I have also been experiencing other similar issues, such as when I have multiple tabs open and I click the close button, and I don't get it asking me if I want to close all the tabs, it just closes, and launches them all back up again as they were next time I open my browser, I even have a problem where sometimes I go to a site, it is the only tab, I close my browser, the next day when I boot my machine up, and start my browser, it goes to where I left off when I last closed my browser instead of opening my startup pages. These issues come and go though and are likely to just be bugs, however almost every time I start up my browser, it starts the video I stated above, and although it is nice at first, that video really does get a little annoying...

So really that is my question, how can I get Firefox to startup and not have that video as an additional startup page? And why I am I experiencing these very similar issues any way? Bug? Or something else?

If it helps, I am on Ubuntu Gnome 15.04, with Gnome Shell, and Gnome 3.14.

Firefox Plugins and Extensions:

For those of you who do not want to go to the video at least until you have seen what awaits you there:

Information Update:

I have tried purging and reinstalling Firefox as well as deleting everything in ~/.mozilla/firefox.

OS Information:

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.04
Release: 15.04
Codename: vivid

Package Information:

firefox: Installed: 39.0+build5-0ubuntu0.15.04.1 Candidate: 39.0+build5-0ubuntu0.15.04.1 Version table: *** 39.0+build5-0ubuntu0.15.04.1 0 500 vivid-updates/main amd64 Packages 500 vivid-security/main amd64 Packages 100 /var/lib/dpkg/status 37.0+build2-0ubuntu1 0 500 vivid/main amd64 Packages

1 Answer

Sounds like a session problem. Firefox can restore sessions with each start. So you might want to try this. You don't say which version it is so I'll give an answer how it can be solved in the version I use.

Go to: Options > General > When Firefox starts > change the option from “Show my windows and tabs from last time”. Now restart and the annoying tab should be gone All other tabs are gone too so make bookmarks if you want fo keep (some of) them.