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Using liberty-minded opensource tools, and using them well

Security Settings for Iceweasel

Tweaking Iceweasel's default settings to provide more control and peace of mind when it comes to security.

What is a browser, really?

So browsers are INCREDIBLY insecure. I like to view them as a portal to the internet, but not as, say, ssh or wget is. No, this is a portal that has to anticipate all use-cases, and basically handle anything that any web-dev has to throw at it. And trust me, they have a shit ton of weapons in their arsenal. Not only does it need to render everything flawlessly, it has to do it securely and quickly. Now, in all practicality, no tool exists that is perfectly flexible, secure, and fast; it’s always a compromise between those three factors. You, however, can help Iceweasel by making a few small sacrifices, something a mature person should have no problem doing. And in doing so, you’ll secure yourself, you’ll secure the web, and you’ll promote responsibility world-wide. Think I’m overexaggerating? Check out how much revenue comes out of web advertising and scamming every MONTH. Even the playing field with your knowledge.

Peace-of-Mind vs Ease-of-Use

These two may seem to always be at odds with each other, and to a point it’s reminiscent of the ongoing struggle of cryptographers vs cryptoanalysts, never seeming to end in this cat and mouse game, but they can occasionally play nice with each other. It’s like I said, it taks a little sacrifice. But there are ways to work around it, and the time invested upfront will lead to a mutually beneficial compromise between security and user friendliness. Keep that in mind while I outline these following ideas.

Keep in mind, before (but mainly after) installing/settings these addons/configs/whatever-this-morphs-into, Read The Furnished Material. There may be functionality out the wazoo that you’re not aware about because you were too excited to get started searching for the latest celeb gossip. Don’t be that person. RTFM.

Extra Credit

Read through the 13 pages on

(It is meant for Windoze users, but is applicable in most respects to Linux users also. Well, page 4 and beyond anyways.)


Just a heads up, if you’re using Private Browsing, skip to the next section. This doesn’t really pertain to you.

As any internet afficianado knows, the history of one’s past browsing habits may be that he/she has a vested interest in controlling access to, or at least the duration and type of saved information. So, let’s get to it.

To access and delete the history is a trivial matter. Access it with a Ctrl-H and close the window with the same. The top right menu has history as one of the prominent choices there which will let you view/delete/restore part/all of your browsing history. Easy enough.

Firefox v33.1 added a new “Forget” button that will let you delete the last pre-determined timeframe worth of browsing history.

And until I can think of a good reason to expand this section, I’m going to move on to the reason why there’s not much sense in this.

Private Browsing

Private Browsing is not private. Not by a long shot. But it does delete the cookies, passwords, search entries, and/or temporary internet files that you picked up in your browsing. Times article

To implement, go to the Iceweasel preferences, and on the ‘Privacy’ tab, switch the ‘History’ value to: ‘Never remember history’. Done. If you access it off of your desktop, you may be able to right-click and select it, but I don’t use any functionality of that sort.

This will NOT protect you from being spied on by any three-word agencies or your ISP, employer, or hackers. This is solely to prevent your history to be accessible if anyone were to access your computer itself. So some might say that this renders this setting useless. I disagree

This will make sure that your system stays clean of any cruft that may build up over time. Imagine finding this ability out for the first time, accessing it, and seeing that the number of cached items that are on your computer are nearly double the dollars in your annual salary. Decruft.

Also (barring a password manager and cookie manager) this keeps you secure by forgetting your sensitive information after you logout. You ever see someone’s facebook get “hacked”? Yeah, someone stole their laptop at the sleepover and locked themselves in the bathroom. Not much of a “hack” if you ask me, but one that certainly can be avoided by practicing good browsing hygiene.

Now if you’re worried about all of the cool pages that you stumbled on getting lost in time, I urge you to consider the benefits of a well setup bookmark management system. Something I plan to put together soon under the “useability” umbrella.

Proxy (or Why Not to Use One)

Icewease has an integration feature when it comes to using a proxy while browsing the interwebz.

Basically this is nothing but the appearance of security.

They are libel to share any and all information that is passed through them, and in fact, all it does is add another step to the route that you sensitive data (hopefully encrypted!) passes through.

Not to say that proxies are useless. I used a proxy daily in the computer lab all throughout high school. But that was because the school didn’t implement their site blocker correctly, and there were times where I needed to access legitimate, but perhaps provocative, information. And it was just easier to use a proxy rather than get a VPN for myself at that young age. Hell, bitcoin wasn’t around then and I didn’t have any credit to speak of.

But they did slow down my browsing, and there was literally no advantage to using it besides to get around a misguided attempt at restriction. And remember, if you don’t pay for the product…you may just be the product.

Auto Update

Iceweasel is Debian’s branding of Firefox. So there is really no updating that needs to be done other than the regular system updates that I’m SURE are properly implemented by your own selves. But what about keeping the rest of Iceweasel up to date?

Well, this is easy.

Extensions: Will automatically update

Security Patches: Will automatically update

Plugins: Addons -> Plugins -> “Check to see if your plugins are up to date”

Search Engines: Preferences -> Advanced -> Check box “Automatically update Search engines

And if I find anything else, I’ll add it later.

Do Not Track feature

Now, it may seem counter-intuitive to suggest that you NOT enable firefox’s default tracking opt-out feature, but trust me, it’s doing more harm than good. All it’s doing is politely asking the webserver if it’d be so kind as to not put any cookies in this particular browser, and not store any information if at all possible on the local machine.

After which it promptly gets flicked the finger and logged as a suspicious IP for wanting privacy by the webserver and whoever the webserver is communicating with (/is infultrated by). There are better ways of defeating agressive tactics such as these. Mainly they involve tricking the system into thinking that they have successfully installed their software and then purging it all to /dev/null. Muahahahahaha.

Permissions Manager


Feel free to muck about. Several settings to look closely at:

  • Store Passwords
  • Share Location
  • Use the Camera
  • Set Cookies

Just take a second to imagine if those were all set to “Always Allow”. Now you can browse with a little more piece of mind that you have control over those settings.

As an aside, this is the easiest place to manage my cookies. Keep in mind that cookies allow you to stay logged in on a website. Without it, every new page that you would visit would automatically log you out again, because you have no cookies to indicate that you already successfully verified with that site. So cookies aren’t bad, but they are a tracking tool.


Flash is a very highly vulnerable proprietary protocol. If that sentence doesn’t convince you to go to about:addons and disable it, then perhaps a quick DDG search will. I’ll wait…go ahead. Good? Good. Now just freakin disable it. We aren’t in highschool playing that 2D motorcycle game anymore, Flash is just unnecessary and going to be replaced by HTML5 anyways (did you see any of that pop up in your search?). Wake up…it’s time (for it) to die.


So each browser has a fingerprint that can be manipulated to be more or less obscure based on how much information is given out. is a very effective site at demonstrating just how unique your browser is.

Javascript redux

Sometimes NoScript isn’t enough. Sometimes you have to set javascript.enabled to “False” in about:config. Maybe you should do that. Maybe you should do that right now. Up to you.

User Agent String

Ever wonder what your browser’s metaphorical license plate number is? Well, there’s not really one. But your year-make-model would be comparable to your User Agent string. Change this and no one will know how you got where you were going, but you showed up to the party. Unfortunately in Iceweasel, the setting doesn’t automatically exist to change this. So make it.

Go into about:config and search useragent. Click in the whitespace below the two-three results and select “New” –> “string”. Enter in general.useragent.override as the preference and leave the string value blank. You are now a veritible low-rider on the interwebz.

EDIT: See Security Plugins for Firefox for the addon version.

That about wraps it up

Don’t forget there are four parts to an iceweasel setup, and this is only one of them. The other three are crucial as well in order to get a reliable, well-functioning web browser up and running.