Firefox Tips


Entering 'about:plugins' (without quotes) in the address bar shows a list of currently installed plugins.

On Debian 6.0 (Squeeze) the Iceweasel plugins are installed in /usr/lib/mozilla/plugins

Unblocking Blocked Extensions and Plugins

If you're having trouble getting an extension working and Firefox is blocking it, you can disable extension blocking by modifying the Firefox configuration. Enter about:config in the address bar.

Find the extensions.blocklist.enabled entry and toggle its value to false.

Only visit trusted sites whilst the blocklist is disabled and bear in mind trusted sites could be compromised without your knowledge. It's probably a bad idea to leave it disabled...


The MozEX plug-in allows you to configure a text editor for viewing page source and editing text areas.

It's All Text

It's All Text! - a plugin which allows you to configure an external text editor which can be launced from HTML TEXTAREA elements.

Spell Checker

Install the appropriate language pack. E.g. in Debian 5.0 (Lenny) the British language pack is installed as follows:

   # apt-get install iceweasel-l10n-en-gb

Iceweasel is the Debian version of Firefox.

Changing Language Settings

Changing the language settings is done by right clicking on a field and selecting the appropriate language.

See also

Developer Plug-ins

Install the following packages from Debian 5.0 (Lenny)

   # aptitude install iceweasel-firebug iceweasel-webdeveloper

Alternatively visit the Web Developer and Firebug home pages.

Configuration Settings

Advanced configuration settings can be modified by entering a URL of about:config in the address bar.


Apparently, it is a bad idea to modify about:blank:


Disable caching


default is:


Latest Firefox on Debian

Add the following to /etc/apt/sources.list.d/

    $ cat <<EOF | sudo tee -a /etc/apt/sources.list.d/iceweasel.list
deb squeeze-backports main
deb squeeze-backports iceweasel-release

Update your package list:

    $ sudo apt-get update

Install the Mozilla archive keyring package:

    $ wget
    $ sudo dpkg -i pkg-mozilla-archive-keyring_1.0_all.deb

Install the iceweasel package from squeeze-backports:

    $ sudo apt-get update
    $ sudo apt-get install -t squeeze-backports iceweasel


Certificates SSL/TLS

Qualys SSL Labs have an SSL Server Test as well as an SSL/TLS Client Browser Analyser

Font Issues

-- Frank Dean - 21 Jan 2016

Android Version - Disabling Form Fill

  1. Enter about:config in the address bar.

  2. Type browser.formfill.enable in the search box

  3. Press the Toggle option alongside browser.formfill.enable to change the selected value to false

-- Frank Dean - 01 May 2017


-- Frank Dean - 07 Sep 2009

Related Topics: EmacsTips