Firefox, the free web browser developed by Mozilla, has blocked Flash due to security issues. The browser developer, dedicated to protecting its millions of users around the globe, has revealed on a tweet the reason behind the act.

Flash, the famous plug-in that allows online animations, graphics and browser games, has been discovered vulnerable which pushed Mozilla to block add-ons and software in order for the Firefox security not to be compromised.

Although the ban is temporary, Firefox will continue blocking Flash supported add-ons that pose security threats to the public. Adobe, the developer of the plug-in is now working to resolve the issue.

Despite the blocking made by Mozilla, users can still continue running Flash on Firefox depending on their choice and they have the option to ignore the security warnings provided.

This incident has become a threat to Flash which is being requested to be killed. Facebook's chief information security officer Alex Stamos has ordered Adobe on Twitter to kill the plug-in once and for all.

"It is time for Adobe to announce the end-of-life date for Flash and to ask the browsers to set killbits on the same day."

Steve Jobs was among the prominent personalities opposing Flash. The brilliant Apple co-founder once criticized the technology calling it insecure and inefficient. Jobs swore not to include it in any of his mobile products. Earlier this year, Google removed the Flash plug-in on YouTube.

Recently, Adobe received criticisms about the software. The developer has been struggling to look for supports for Flash. Leading Internet companies have started abandoning the older standard. HTML5 became the common option when mobile devices started gaining popularity.

In the year 2011, Adobe recognized the potential of HTML5 in developing and deploying content in the browser across mobile platforms that they have discontinued producing new versions of Flash.