Every time I start Firefox, why do I get a Google sign-in tab?

I’m using Firefox for Mac vets. 34.0.5, and I get that extra tab that opens every time I start Firefox in addition to the Home page I specified in Preferences. How do I stop that from happening?

Type '''about:config'''<Enter> in the address bar.
If a warning screen comes up, press the '''Be Careful''' button.
This is where Firefox finds information it needs to run.
At the top of the screen is a search bar. Type '''browser.newtab.url'''
This tells Firefox what to show when a new tab is opened.
If you want, right click and select '''Modify'''. You can change the setting to;
'''about:home''' (Firefox default home page),
'''about:newtab''' (shows the sites most visited),
'''about:blank''' (a blank page),
or you can enter any '''web page''' or '''about: page''' you want.
The same instructions are used for the new window setting, listed as
'''browser.startup.homepage'''.

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