Add some extra functionality to Firefox from the about: config

Reading my RSS I find an interesting article in Engadget where they show us 10 tricks or functionalities that we can activate in Firefox from the about: config. In this case I put the ones that I found most interesting:

Show thumbnails with Ctrl + Tab:

It has been something very similar to what we have on our desktop when we use the keys Alt + Tab. To activate it we change the value browser.ctrlTab.previews a true.


Show / hide buttons to close tabs:

I close my tabs by pressing the mouse scroll, so I don't need to have close buttons on the tabs, or at least not on all of them. Accessing the parameter browser.tabs.closeButtons and changing the values ​​we can have the following values:

  • 0 (shows the close button only on the active tab).
  • 1 (by default, it shows the close button in all).
  • 2 (does not show the button in any tab).
  • 4 (shows a single button at the bottom of the tabs).

Avoid going back with the backspace key:

We already saw this trick in FromLinux, But doing just the opposite. If we want to put everything by default we can deactivate it by changing the parameter browser.backspace_action a 2.

Show "http: //" in all directions:

Well, if you want to see the http: // again in the address bar, you just have to put the parameter browser.urlbar.trimURLs en false.

Disable timeout before installing a plugin:

Every time we want to install a new add-on, it shows us by default a countdown before we can click the "Install" button. We can change this by putting the parameter security.dialog_enable_delay in 0.

Enable "Save and close" when closing Firefox:

Actually when we close Firefox with open tabs, we can reopen them if we put in the URL bar about:home and click on the button: Restore previous session, or something like that. However, if you want to make sure that Firefox saves what we have open, we change the parameter browser.showQuitWarning a true.

Show search results in a new tab:

To do this we change the parameter a true.

You can see other tricks in the original article of Engadget.

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  1.   elendilnarsil said

    Great, thanks for the tricks Elav.

  2.   Alf said

    The one I liked the most was the first, very useful for me.

  3.   Yohan Graterol (@yograterol) said

    Good article, I like Firefox and these tips are great! 🙂

  4.   NotFromBrooklyn said

    I didn't know about the previews. Activated, hehehe.

  5.   Rob3r said

    I take it to ffmania?

  6.   st0rmt4il said

    Thanks for the Tip!


  7.   eliotime3000 said

    The tips are very good. Now, to activate the previews with Ctrl + Tab on my Iceweasel.

  8.   Oscar said

    Excellent, many useful things.

  9.   Actor said

    Very good. Forgive my question but .. How can I disable that blessed google ad "Install Google Chrome" in Firefox. Cheers

  10.   Fungus said

    For added security, disable Referers.

    How to do it:

    This famous misspelled header typically sent by default with every HTTP request gives a lot of potentially personal information to websites. But you can disable it. Open a new tab and in your address bar enter "about: config". You will see a warning to be careful what you do. Click on "I'll be careful, I promise!" In the search bar, type "referer." You should see the [field] "network.http.sendRefererHeader". Double click on it and change the value to 0:

  11.   Aleksombra said

    Great tricks, thanks

  12.   izzyvp said

    Wow, they are very good tips. Thank you