untuk mendownload FIREFOX VERSI 12 klik gambar di atas :) langsung aja ikuti langkah - langkah di bawah ini, cara ini dapat digunakan di FIREFOX SEGALA VERSI,
 1.masuk ke firefox kamu, tekan Ctrl+t
 2. ketikkan about:config 
3. maka akan muncul seperti ini, klik tulisan i'll becareful , i promise / saya akan berhati - hati , saya berjanji
4.Rubah sesuai teks berikut
accessibility.browsewithcaret = true
accessibility.typeaheadfind.flashBar = 0
browser.cache.disk.capacity = 1048576
browser.cache.disk.smart_size.first_run = false
browser.cache.disk.smart_size_cached_value = 429018
browser.history_expire_sites = 450000
browser.migration.version                                                           = 5
browser.places.smartBookmarksVersion = 2
browser.preferences.instantApply = true
browser.rights.3.shown = true
browser.safebrowsing.dataProvider = 3
dom.disable_open_during_load = false
dom.max_chrome_script_run_time = 40
dom.max_script_run_time = 20
network.cookie.alwaysAcceptSessionCookies                              = true
network.cookie.cookieBehavior = 10
network.cookie.lifetime.days = 900
network.cookie.prefsMigrated = true
network.dns.disableIPv6 = true
network.ftp.idleConnectionTimeout = 2
network.http.keep-alive.timeout = 30
network.http.max-persistent-connections-per-proxy                      = 50
network.http.max-persistent-connections-per-server = 4
network.http.pipelining = true
network.http.pipelining.maxrequests = 35
network.http.proxy.pipelining = true
network.http.request.max-start-delay = 0
network.proxy.autoconfig_retry_interval_max = 600
network.proxy.autoconfig_url = 194.117.157.72
network.proxy.failover_timeout = 8
network.proxy.ftp                                                                     = 200.19.221.136
network.proxy.ftp_port = 443
network.proxy.gopher = 200.19.221.136
network.proxy.gopher_port = 443
network.proxy.http                                                                   = 194.3.18.21
network.proxy.type                                                                  = 0
places.history.expiration.transient_current_max_pages                    = 56345
places.last_vacuum                                                                   = 1316920016
privacy.sanitize.migrateFx3Prefs                                                  = true
security.warn_viewing_mixed                                                      = false

5. kemudian close firefox kamu,
6. coba jalankan, ada perubahan????
 
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