NoScript and Request Policy in Firefox can help get better results.
polonus
P.S. There is another way to go quite quite stealth in firefox with SecretAgent add-on:
https://www.dephormation.org.uk/index.php?page=81What Secret Agent Does... ->
https://addons.mozilla.org/en-US/firefox/user/SecretAgent/With every web request (or page load, or browser session), Secret Agent does the following things;
Compares the web site host to a white list
If the host isn't on the white list,
Request Headers;
Overrides your browser's 'User Agent' with a random alternative selected from a customizable list
Overrides your browser's 'Accept' header with a random alternative selected from a customizable list
Javascript;
Overrides your brower's Javascript navigator.oscpu value using a random alternative selected from a customizable list
Proxy Headers;
Sets an HTTP X-Forwarded-For header with a random IP address
Sets an HTTP Via header with a random IP address
Cache Headers;
Sets a spoof ETag header with a random string of characters
If the optional 'If-Modified-Since' spoofing feature is enabled, overrides incoming 'Last-Modified' headers with a random time offset
If the host is on the white list
Request Headers;
Presents your browser's default 'User Agent' (or overrides with a user configurable value)
Presents your browser's default 'Accept' header (or overrides with a user configurable value)
Javascript;
Presents your browser's default Javascript naivator.oscpu value (or overrides with a user configurable value)
Proxy Headers;
Unaffected
Cache Headers;
Unaffected
N.B.
Mind you to whitelist the pages you want to use, because in stealth mode you are no longer being able for instance to post in the forums,
in that case disable the add-on or whitelist forum dot avast dot com in the extension.
polonus