Why am I having so much trouble signing in to Mozilla

Question

Every time I try to sign in it will not take username and password so I have to change it and then I forget what I changed it to.
Also why can't I watch videos on facebook I can with Internet Explorer Windows 7

Answer 1

Some added toolbar and anti-virus add-ons are known to cause
Firefox issues. '''Disable All of them.'''
In the event that the passwords information is lost, you
should record all information in a separate text file somewhere else
on your hard drive, or written down. You can easily copy and paste if
you need to do so. If you are concerned about someone else looking
at that file, you can compress it using a password.
Many site issues can be caused by corrupt cookies or cache.
* Clear the Cache and
* Remove Cookies<br>'''''Warning ! ! '' This will log you out of sites you're logged in to.'''
Type '''about:preferences'''<Enter> in the address bar.
* '''Cookies;''' Select '''Privacy.''' Under '''History,''' select Firefox will '''Use Custom Settings.''' Press the button on the right side called '''Show Cookies.''' Use the search bar to look for the site. Note; There may be more than one entry. Remove '''All''' of them.
* '''Cache;''' Select '''Advanced > Network.''' Across from '''Cached Web Content,''' Press '''Clear Now.'''
If there is still a problem,
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
While you are in safe mode;
Type '''about:preferences#advanced'''<Enter> in the address bar.
Under '''Advanced,''' Select '''General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites. Are there any problems?
Then restart.