Firefox manual settings

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En2.png De2.png  Main Page (en) Alternative browser configuration (en)

This manual is not complete and not verified or maintained by JonDos. Please address possible questions to the forum, or major contributors to this page (see history), not the support of JonDos.


Firefox manual settings

Proxy Settings

Tools -> Options -> Advanced -> Network -> Settings -> set "Manual proxy configuration" , , 4001 , "Use this proxy server for all protocols".


Firefox Tweaks

Local / Web / DOM storage

Enabled by default, should be disabled: type "about:config", confirm warning, and set "" to "false".


Since version 3.6.14, Firefox uses a plugin-container - this is a security feature, a crashed plugin will not crash the browser, but it doesn't really help with privacy.

Tools -> Add-ons (connects to the Internet)

You can control Plugins also with the NoScript addon: NoScript - despite its name, it controls not only JavaScript, but also plugins.


Since version 3.6, there is no more an "Enable Java" checkbox, Java is just a plugin like any other one and can be controlled in the plugin list. By default Firefox (like other browsers) will use Java found on the system, so after installing JonDo, you have to disable Java in Firefox. The other and probably safer way to block Java is to install JonDo as "portable" - in that case Firefox (like other browsers) will simply not find the Java used by JonDo (there should be no other Java on the system).


Don't use a PDF plugin, download the file and view it separately outside of the context of the browser, or use an online converter.

Open Source PDF viewers for various operating systems can be found at

Recommended PDF viewers: SumatraPDF (Windows only), MUPDF, XPDF (GUI viewer only Linux).

Sumatra PDF


Security related addons for Firefox Browser

MD5 Reborned Hasher

Download: MD5 Reborned Hasher 0.9.0

Allows to check MD2, MD5, SHA1, SHA256, SHA384 and SHA512 values of downloaded files.

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