If you have not installed Adobe Flash (perhaps because you do not need it) and you visit a website containing Flash animation or movies, then Firefox notifies you to install Flash. This notification may be useful for those who would want to install Flash, but it is very annoying if you wish to stay away from Flash and just want to use HTML5 media. If you do not like this notification in Firefox, then you can easily disable it using the following instructions.
- Open Mozilla Firefox browser. In the location bar type about:config and press Enter.
- Firefox will show a warning. Click on the button labeled I’ll be careful I promise! to proceed.
- In the Filter field, type notifymissing to narrow down the search to the preference value we are looking for. You would see a preference named plugins.notifyMissingFlash as shown.
- Double click on plugins.notifyMissingFlash to change its value to false.
- After changing the value, restart the browser for the changes to take effect.
After this, Firefox will no longer bother you about installing Adobe Flash even when you visit Flash rich websites like Youtube. But later if you decide to install Flash, then you can always visit the Adobe Flash website http://get.adobe.com/flashplayer/ to download and install Adobe Flash plugin for your web browser.