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Firefox: Secret Functions

  • Jan 05, 2026
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In this practical tip we can provide you with the secret functions of Firefox. With these Features, you are guaranteed even more from your Browser, get out and surf even more conveniently. In the Video above, you will also see the practical Add-On Firefox Side View, with a Browser Tab as a second, built-in window in Firefox window, can open.

Secret feature of Firefox: the address automatically .de complete

If you are in the address bar of your Firefox , a webpage, enter the .com often supplemented. This allows you to reach faster to the desired page. By the following steps, you instead of can .com the German ending .de can:
  1. Type in your Firefox Browser in the address about:config"".
  2. Search for "browser.fixup.alternate.suffix“. With a right-click > edit, replace the ending ".com" by ".de“.
Firefox Secret function enable

Tab preview in Windows taskbar

With this setting, you get the handy preview in the Windows task bar only for the open Tab. If you switch the Option, you can scroll in the Windows task bar between the preview of the open Tabs of Firefox.
  1. Open the advanced settings by entering "bar about:config" in the address.
  2. Search for "browser.taskbar.previews.enable“ and set the value with a right-click on "true".

Faster Surfing through secret setting in Firefox

With this expert method you can get even more speed from your Firefox Browser. By default, this Option is disabled, unfortunately, Firefox.
  1. Open "about:config" and type in the search box "network.http.pipelining" is a. Set this entry with a right-click > toggle to true.
  2. Then, you should set the entry "network.http.proxy.pipelining" to true.
  3. In the case of the setting "network.http.pipelining.max-optimistic.requests" increase the value from 4 to 8.
  4. Once a Server does not support this function, so clear the above settings.

Preloading of web pages in the Browser and bind

The Pre-Loading of a web page can be quite useful. If you want to turn off the Feature, nevertheless, you need to edit in "about:config" the following entries:
  1. Type in the Filter bar "network.prefetch-next", so that this value will be displayed.
  2. In the default network is ".prefetch-next" to "true".
  3. The Preloading stop, click on the value twice. It is set to "false".

Copied Text by using the mouse wheel to paste

By default, copied Text you can Paste via the right mouse key and the command or the key combination "Ctrl+V" will be inserted. About "about:config", the operation comfortably on the mouse wheel route:
  1. You switch the entry to "middle mouse.paste the" from "false" to "true".

Memory optimisation in Firefox

Firefox can consume, depending on the open Tabs and websites, a lot of memory. A Trick you can do to improve via "about:config" in the memory Management. Thus, Firefox is made, in this respect, the Browser is minimized, there is less memory available:
  1. Add a new entry by clicking with the right mouse button on the list. In the context menu, you first go to "New" and then "Boolean".
  2. You carry the name of the property "config.trim_on_minimize" in.
  3. Select for the new property the value "true".

Statistics at a glance

Who has the Overview, with this setting, the statistics on statistics.
  • You type in the address bar "about:health report", you can not only read the version number and Release Channel. Here you find, how many meetings you had with the Firefox Browser and how long you have used. Crashes are just listed as Addons.
  • With "about:crashes" you will see the crash reports. You are on telemetry data, you will receive this with the "about:telemetry". Be displayed then the collected information about performance, Hardware, usage and user-made Changes - which by the way is sent to Mozilla.
  • Anyone who is interested in the memory usage, the exciting Details with "about:memory".

Without add-ons start Firefox clean up

The Firefox, can't test here whether the Addons are to blame.
  • You type In the address bar "about:support", you can try out in the event of a Browser problem, Firefox in the safe mode. To do this, click on the "disabled Add-ons and restart."
  • The Problem in safe mode is not fixed, you can put "about:support" with a "Firefox clean" the Browser back. Then not only are all the Addons are removed, it is also the default settings are restored.
In the next practical tip we will show you other ways on how to make your Firefox speed up can.

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