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Security and passwords settings

This article explains the settings available in the Security panel of the Firefox OptionsPreferences page. The Security panel contains optionspreferences related to keeping you safe on the Internet.

Table of Contents

Fx43-SecurityPanel Fx48-SecurityPanel

General

  • Warn me when sites try to install add-ons: Firefox will always ask you to confirm installations of add-ons. To prevent unrequested installation prompts which may lead to accidental installations, Firefox warns you when a website tries to install an add-on and blocks the installation prompt. To allow installations from a specific site, click Exceptions…, enter the site name, and click Allow. Uncheck this to disable the warning for all sites.
  • Block reported attack sites: Check this if you want Firefox to check whether the site you are visiting may be an attempt to interfere with normal computer functions or send personal data about you to unauthorized parties over the Internet.
    • Note that the absence of a warning does not guarantee that a site is trustworthy.
  • Block reported web forgeries: Check this if you want Firefox to actively check whether the site you are visiting may be an attempt to mislead you into providing personal information (this is often referred to as phishing).
  • Warn me when sites try to install add-ons: Firefox will always ask you to confirm installations of add-ons. To prevent unrequested installation prompts which may lead to accidental installations, Firefox warns you when a website tries to install an add-on and blocks the installation prompt. To allow installations from a specific site, click Exceptions…, enter the site name, and click Allow. Uncheck this to disable the warning for all sites.
  • Block dangerous and deceptive content: Check this box if you want Firefox to block potential malware or content that can trick you into downloading malware or unintentionally entering information. You can also refine your choices by checking or unchecking the items in this section:
    • Block dangerous downloads: Blocks potential viruses and other malware.
    • Warn me about unwanted and uncommon software: Lets you know if you're about to download potentially unwanted software or uncommon software that may contain a virus or make unexpected changes to your computer.
Note: The absence of a warning does not guarantee that a site or download is trustworthy. For more information, see How does built-in Phishing and Malware Protection work?.

Logins

  • Remember logins for sites: Firefox can securely save passwords you enter in web forms to make it easier to log on to websites. Clear this checkbox to prevent Firefox from remembering your passwords. See Password Manager - Remember, delete, change and import saved passwords in Firefox for details.
    • Even with this checked, however, you'll still be asked whether to save passwords for a site when you first visit it. If you select Never for This Site, that site will be added to an exceptions list. To access that list or to remove sites from it, click the Exceptions… button.
  • Use a master password: Firefox can protect sensitive information such as saved passwords and certificates by encrypting them using a master password. If you create a master password, each time you start Firefox, it will ask you to enter the password the first time it needs to access a certificate or stored password. You can set, change, or remove the master password by checking or unchecking this optionpreference or by clicking the Change Master Password… button. If a master password is already set, you will need to enter it in order to change or remove the master password.
  • You can manage saved passwords and delete individual passwords by clicking the Saved Logins… button.
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Thunderbird

Version History
Revision #:
3 of 3
Last update:
3 weeks ago
Updated by:
 
Comments

Hi,

I noticed the line for the Saved passwords button was removed today, as it apparently was fx3 only. However, this is an option still available in Fx3.6 and 4. Is it possible that it had erroneously been marked as fx3 only, and thus, is still needed/valid?

See /forums/knowledge-base-articles/705115 for related discussions about this article.

Hello Tonnes, it has been added again in the article.

I locked this thread.



Note: The article was revised to add back the saved passwords line in revision 14588 which was approved Jun 8, 2011. aw

The article links to an archived article of little value How the phishing and malware protection in Firefox works so that should IMO be removed.

A direct link could be added to http://www.mozilla.com/firefox/phishing-protection/ but that in turn produces problems with links for a demo that currently works in Firefox 11 but not the supported Firefox 3.6 and 9.

Related discussion /forums/contributors/708095 & note several bugs relate to this issue including comment bug707652#c
The pages were moved, but most Firefoxes out there still have an old database. The database is updated only from Firefox 11 on. I've just filed a request to uplift this to Firefox 10 as well.

I added this article to the Need Changes "to do" list with a note, "Remove link to archived phishing article or incorporate info at next update" with a link to this thread.

(For the record)

Scoobidiver made a revision on August 1, 2012 (approved by me today) that included replacing the link to the archived How the phishing and malware protection in Firefox works article with a link to http://www.mozilla.org/firefox/phishing-protection/ "Firefox Phishing and Malware Protection".

I updated the article and screenshot for Firefox 43 since the "Passwords" section now shows "Logins". Related discussion: https://support.mozilla.org/en-US/kb/password-manager-remember-delete-change-and-import/discuss/6338 "Login Manager" Needs change entry

Tonnes said (December 27, 2015)

See previous reply. :) Apparently all platforms are using Saved Logins… since 43 (not 41). See bug 1199382 for reference. I made a few revisions to use the same wording for 43+ as well as the image, since there are no OS specific images involved, and added an initial change for the removed button in 44. The Saved Logins… change could need review for Linux, and the screenshot using the Show Passwords… button may need to be changed to exclude that for 44. And of course, anything could be improved.

New security panel in 48

  • Security panel fx48

I set up a Needs change" entry.

The new security panel appears to be related to the following (fixed in Firefox 48)

Bug 1265359 - Enable blocking of potentially unwanted downloads

Bug 1265358 - Enable blocking of uncommon downloads

Thanks for flagging this, ideato and Alice. I've updated the article, but can someone check my revision to make sure I didn't miss anything?

I'll ask Peter from the product team as well.

Thanks!

Hi, Joni. I made some edits you your pending revision based on the new UI shown in the screenshots included in this bug report: Bug 1265362 - Update strings for the new user interface of blocked downloads

Also, we link to the following article which also needs updating for Firefox 48: How does built-in Phishing and Malware Protection work?

Related discussion: https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work/discuss/6623 Preference UI is different in Firefox 48

Related bug report: Bug 874408 - Revisit the Safe Browsing preferences

I made a couple of other edits to the pending revision, including removal of the "Block reported web forgeries" item for fx48.

The currently used "Image:48 security panel" looks fuzzy:

48 security panel

I uploaded a new image and added it to the article: Image:Fx48-SecurityPanel

Fx48-SecurityPanel