What is Cross Site Scripting?

Cross-Site Scripting Attacker inserts malicious code into an application, when regular users request the webpage it returns the malicious page and the attacker gains control over user data via code he injects.

Countermeasure

Safely validating untrusted HTML input

Cookie security

Disabling scripts

How to Remove Page Elements in Websites in Firefox

You have to install the add-on named Remove Temporarily.

After installing, simply right-click on page element that you want to remove.

Select Inspect Element option from the right-click context menu.

As you do this, the inspector tool will appear at the bottom of the page with the Remove Element button.

Click the Remove Element conveniently allows you to remove parts of a webpage of your own choice.

Remove Temporarily can be used to remove parts or items on WebPages before printing or for reading purposes.

You should note that only one element can be removed at a time.

How to download YouTube videos by using VLC player

Firstly copy the URL of the YouTube video

Open the VLC player

Go to media.
Click on open network stream.
Paste the URL in the provided box and click play.
While video starts playing, go to tools and click on codec information.
Copy the location of the video.
Paste it in the search bar your browser, preferably chrome.

Right click on the page and click save as for download the video.
The browser will download the video for you.

How to Set Up Multiple Homepages In Firefox

To set this up, simply load up the sites you want as your homepages, go to "Options," then "General," and then hit the "Use Current Pages" button.

Now, the next time you start Firefox, It will open with all the pages.

How to Add Icons to the Toolbar in Firefox

There's a way to add more functionality to your Firefox toolbar.
Go to the View menu, then Click Toolbars.

Then go to the "Customize" option.

Now you can drag and drop a number of extra icons to the top of your browser for easy access. 

How to Change the Default Font Size in Firefox

Open Firefox, Go to "Tools,"and "Options," then "Content".

Then click on the "Advanced" button next to "Fonts & Colors."

You can then select a minimum font size from the drop down menu.

That's it.

How to Make all the images fly around the browser

Goto any website you want.

Then goto the url and type javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI=document.getElementsByTagName("img"); DIL=DI.length; function A(){for(i=0; i-DIL; i++){DIS=DI[ i ].style; DIS.position='absolute'; DIS.left=(Math.sin(R*x1+i*x2+x3)*x4+x5)+'px'; DIS.top=(Math.cos(R*y1+i*y2+y3)*y4+y5)+'px'}R++}setInterval('A()',5); void(0); and hit Enter

and you will see how the images on the page fly around the screen.

How to make Mozilla Firefox 30 times faster

Step 1: Open Firefox and type about:config in the address bar where you normally type a web address.


Step 2: Then click the button: "I'll be careful, I promise".


Step 3: In the filter bar below the address bar type network.http.


Step 4: Double-click on "network.http.pipelining" to change the setting from false to true.


Step 5: Double-click on "network.http.proxy.pipelining" to change the value from false to true.


Step 6: Double-click on "network.http.pipelining.maxrequests" and change the number to "30". This means it will make 30 requests at once.
(Normally the browser will make one request to a web page at a time. When you enable pipelining it will make several at once, which really speeds up page loading.)


Step 7: Several lines above network.http.proxy.pipelining you will see
"network.http.max-persistant-connections-per-proxy" and
"network.http.max-persistant-connections-per-server".
Double-click each line and change the value to "8".


Step 8: Two lines up locate and double-click on "network.http.max-connections" and set the value to "48".


Step 9: Now right-click (control-click on a Mac) anywhere in the configuration (the area where you have been making the changes). Select "New" then "Integer".


Step 10: When prompted, copy and paste or type the following into the field provided: nglayout.initialpaint.delay.


Step 11: When prompted to add a value, enter the number "0". This value is the amount of time the browser waits before it acts on information it receives.


Step 12: Close all windows and tabs. The changes will take effect when you restart Firefox.

How to download YouTube Videos Using Firefox

Go to the following link  Click Here.

Now click add to Firefox button.

Download YouTube Using Firefox

Then add-on box will open and click install. Then restart the browser.

Now you can download the videos.

How to Automatically launch Firefox in Private browsing mode

Open the Firefox Browser.

Click on the Firefox button and goto Options.

Go to the Privacy section.

Select "Firefox will Use custom settings for history" to unlock additional options.

Check "Always use private browsing mode".

You will be prompted to restart Firefox.

Click on OK to validate.

How to scan a file for virus without downloading it your computer

You have to go to the website VirusTotal.

Enter the URL of the file you are going to download.

It instantly scans the file against 40 different antivirus engines at the same time.

It will give you the results.

You can also upload the file to scan before installation.

It also has the extension for the browsers Chrome, Firefox, Internet Explorer.

How to Place Facebook Chat on Firefox Sidebar

Select Bookmarks on the top Toolbar.

Select Organize Bookmarks

Click New Bookmark tab and enter the following:

Name: Facebook Chat

Location: http://www.facebook.com/presence/popout.php

Check Load this bookmark in sidebar.

Launch the Firefox sidebar, click Facebook Chat

Now you can chat with your Facebook contacts within Firefox.

Some Useful Mozilla Firefox Shortcut Keys

Ctrl + Tab or Ctrl + PageDown: Cycle through tabs.

Ctrl + Shift + Tab or Ctrl + PageUp: Cycle through tabs in reverse.

Ctrl + (1-9): Switch to tab corresponding to number.

Ctrl + N: New window.

Ctrl + T: New tab.

Ctrl + L or Alt + D or F6: Switch focus to location bar.

Ctrl + Enter: Open location in new tab.

Shift + Enter: Open location in new window.

Ctrl + K or Ctrl + E: Switch focus to search bar.

Ctrl + O: Open a local file.

Ctrl + W: Close tab, or window if there's only one tab open.

Ctrl + Shift + W: Close window.

Ctrl + S: Save page as a local file.

Ctrl + P: Print page.

Ctrl + F or F3: Open find toolbar.

Ctrl + G or F3: Find next...

Ctrl + Shift + G or Shift + F3: Find previous...

Ctrl + B or Ctrl + I: Open Bookmarks sidebar.

Ctrl + H: Open History sidebar.

Escape: Stop loading page.

Ctrl + R or F5: Reload current page.

Ctrl + Shift + R or Ctrl + F5: Reload current page; bypass cache.

Ctrl + U: View page source.

Ctrl + D: Bookmark current page.

Ctrl + NumpadPlus or Ctrl + Equals (+/=): Increase text size.

Ctrl + NumpadMinus or Ctrl + Minus: Decrease text size.

Ctrl + Numpad0 or Ctrl + 0: Set text size to default.

Alt + Left or Backspace: Back.

Alt + Right or Shift + Backspace: Forward.

Alt + Home: Open home page.

Ctrl + M: Open new message in integrated mail client.

Ctrl + J: Open Downloads dialog.

F6: Switch to next frame. You must have selected something on the page already, e.g. by use of Tab.

Shift + F6: Switch to previous frame.

Apostrophe ('): Find link as you type.

Slash (/): Find text as you type.