Although many times the browser brings with it the necessary settings to have a good operation by default, it is true that you can do some extra things to obtain or eliminate certain functionalities.
All these settings have to be done at your own risk. We open a tab and write about: config, we promise not to put our hands (something that will not be true) and tune Firefox.
1.- Reduce consumption of Firefox when minimized:
New » Logical » config.trim_on_minimize = true.
2.- Disable Extension Compatibility Controls
extensions.checkCompatibility = False
extensions.checkUpdateSecurity = False
3.- Deactivate the Icon (Favicon) of the Pages
browser.chrome.site_icons = False
4.- Disable the Prefetch
network.prefetch-next = False
5.- Disable Flashing Text
browser.blink_allowed = False
6.- Accelerate / Improve the speed of Downloads
network.http.pipelining = true
network.http.pipelining.maxrequests = 8 (Default is 30) Firefox 7 brings 4 default.
network.http.max-connections = 96 (Default is 30) Firefox 7 brings 256 default.
network.http.max-connections-per-server = 32 (Default is 15) Firefox 7 brings 15 default.
network.http.max-persistent-connections-per-server = 8 (Default is 6)
network.http.pipelining.ssl = true
network.http.proxy.pipelining = true
network.dns.disableIPv6 = true
New » Whole » nglayout.initialpaint.delay = 0
New » Logical » network.http.pipelining.firstrequest = true
7.- Deactivate delay time during the installation of Add-ons
security.dialog_enable_delay = 0 Firefox 7 brings 2000 default.
8.- Allow a greater number of tabs per window
browser.tabs.tabMinWidth = 75
9.- Load long pages faster
New » Whole » content.notify.interval = 500000
New » Logical » content.notify.ontimer = true
10.- Ignore interruptions before loading pages
New » Whole » content.switch.threshold = 250000
New » Logical » content.interrupt.parsing = false
11.- Control animations
image.animation_mode = None
12.- To activate / deactivate “1 single click select the URL” in the address bar
browser.urlbar.clickSelectsAll = True
browser.urlbar.clickSelectsAll = False
13.- Autocomplete URL in the address bar
browser.urlbar.autoFill = True
14.- Limit the number of URL autocompletion in the address bar
browser.urlbar.maxRichResults = 20 (Default is 12)
15.- Disable the tips of the toolbars
browser.chrome.toolbar_tips = False
16.- To paste the copied content by clicking with the central mouse button
middlemouse.paste = True
17.- To create a single close button for all open tabs
browser.tabs.closeButtons = 3
18.- Increase the number of recently closed tabs
browser.sessionstore.max_tabs_undo = 15
19.- Right click See code in your favorite editor
view_source.editor.external = True
view_source.editor.path = Path of the editor executable
20.- Enable fast switching between tabs
toolkit.scrollbox.scrollIncrement = 75
21.- Enable spell checking in text fields
layout.spellcheckDefault = 2
22.- Enable the http: // prefix
browser.urlbar.trimURLs = false
23.- Do not highlight the domain in the URL.
browser.urlbar.formatting.enabled = false
Depending on the version of Firefox being used, some of these options may or may not appear.
Original article: Humans.