Someone just told you to “force reload” your browser to fix something.
The Adobe Flash Player browser plugin lets you view video and animated content in Firefox.
If you want Flash to work in Firefox you must install the plugin version, as explained above.
If you were able to load websites until you updated Firefox or until your Internet security software was updated, reconfigured or a new one was added, your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) is likely preventing Firefox from connecting to the Internet.
While some people may not care if websites reload pages automatically, others may disable this functionality by updating their browser settings.
To check your Firefox proxy settings: If you find that changes you make to your Firefox connection settings are not remembered when you restart Firefox, see How to fix preferences that won't save.
Most times a simple force cache refresh won't work and you need to clear the cache by hand.
On this site you can find step by step guides for Chrome, Firefox 3, Firefox 2, Internet Explorer 8, Internet Explorer 7, Internet Explorer 6, Safari and more on how to refresh your cache.
This article has information about testing, installing, updating, uninstalling and troubleshooting the Adobe Flash plugin.
Note: The Firefox Software Update feature does not update installed plugins.