You have asked Firefox to connect securely to mail.google.com, but we can't confirm that your connection is secure.
You've probably seen this error lots of times and wondered what it meant. Secure websites that require HTTPS connection such as Gmail, Paypal, Yahoo Mail, Facebook and others often show this error message. If you proceed and add exception, you might notice the page won't load correctly and the display might look rather abnormal. In such cases, some images may not be displayed and lots of functions on the web page may be disabled.
This Connection is Untrusted - What does it mean?
I really don't need to explain all the technicalities, ...Read more Fix: “This Connection is Untrusted” Error in Firefox
You have asked Firefox to connect securely to mail.google.com, but we can't confirm that your connection is secure.
You've probably seen this error lots of times and wondered what it meant. Secure websites that require HTTPS connection such as Gmail, Paypal, Yahoo Mail, Facebook and others often show this error message. If you proceed and add exception, you might notice the page won't load correctly and the display might look rather abnormal. In such cases, some images may not be displayed and lots of functions on the web page may be disabled.
This Connection is Untrusted - What does it mean?
I really don't need to explain all the technicalities, ...Read more 
You probably use Youtube as much as I do, maybe even a bit more. I do spend time there watching music videos once in a while and sometimes I wish I could save these videos to watch them later. Going back to watch them isn't a great idea since I'll be burning my bandwidth which is limited. The cost of internet isn't so user-friendly here in my country so, instead of going back to youtube to watch those videos again, I simply download them to my computer with Firefox.
There are several posts on the internet about downloading Youtube videos and you're often told to install a browser extension, use a third party service or something but in this 
Maybe you're trying to show how something works to your friends on Facebook or you're a blogger trying to capture a screenshot and add it to a blog post, there are easy ways to get this done and the one you use depends on what you're using the screenshot for.
1. Using the prt sc Button on your Keyboard
Lots of people often see this button on their keyboard without even knowing what it means. The button means print screen and with just this, you can capture whatever you have on your computer screen at that particular time.
After pressing this button, you need to open any image editing software you have installed on your PC. You should, 
Mozilla Firefox stays on the top of my favorite web browsers list followed by Google Chrome and I've mastered almost all the useful shortcuts which simplify and speed up my web browsing. Shortcuts can boost your performance level especially when you've got loads of stuffs to do and there are so many shortcuts on Firefox. You definitely can't know them all but below is a compilation of the most important shortcuts I use that makes it easier surfing the web with Firefox:
F6
Use this function to quickly jump to the address bar without using the mouse or touchpad.
CTRL + TAB or CTRL + SHIFT + TAB
This lets you move forward or backward 
Mozilla Firefox remains my favorite web browser, followed by Google Chrome while I don't even use Internet Explorer at all. Firefox went through quite lots of upgrades in the last couple of years, jumping from version 3 down to 7 but I started disliking the design right from version 4 due to some reasons: the progress bar disappeared and the design looked like an imitation of Opera and Google Chrome. I decided not to upgrade and stuck with Firefox 3.6.10 until recently when I had to install an addon which refused to install on Firefox 3. It was the Google+Facebook add-on I wrote a post on a few weeks back that made me upgrade to Fireox 7.0.1 and 
Mozilla Firefox is personally the best browser I would recommend for anyone who desires speed, reliability and perfect rendering of web pages. Apart from these generally known features that makes Firefox stand out, there is a very good feature on it just for your online security that I just can't find on other browsers. Private Browsing is quite an innovative feature designed for people who use shared computers at work, cyber cafes or schools.When enabled, Firefox never keeps a record of your browsing history for that session. No history or cookies are stored even when you forget to log out of those sites and you can be rest assured no one will 
As the name suggests, Multiproxy Switch is a very useful firefox addon that lets you switch easily between different proxy configurations. It saves you the trouble of having to go to network connections each time you wish to change your proxy settings. This Firefox addon is quite user friendly and easy to configure. It is compatible with 1.5 – 3.5.* and the latest version (v1.33) works with Firefox 3.6.* . The addon works quite smoothly though it's said to be an experimental software.It makes it easy switching between firewall bypassing softwares like Your Freedom, Tor, India Web Proxy, Ultrasurf, Freegate, etc. without the need to go into your