I am using dolphin as my file manager and when I download something via firefox, I right click the download dialog and choose "open folder", I always get nautilus.

Why doesn't firefox open the folder with dolphin? Thanks

Note: I tried adding the tag "dolphin" but because of my low rep I can't create new tags :(

  • 1
    I have added the dolphin tag for you. Aug 17, 2010 at 16:15

7 Answers 7

sudo apt-get install kmozillahelper

is not more available.

How to use dolphin to open folder in firefox

When I installed KDE and Firefox this feature actually worked – I downloaded a file, clicked on “open containing folder”, and Dolphin would happily pop with the respective folder open.

However, when I installed a few more apps, Firefox started calling Gwent or other app to “open the folder”.


In the file /usr/share/applications/mimeinfo.cache, find inode/directory and make kde4-dolphin.desktop on first such as:

  • 2
    I did it and it did not help... Jan 3, 2017 at 3:50
  • I needed to use org.kde.dolphin.desktop instead of kde4-dolphin.desktop.
    – tobiasBora
    Feb 5, 2018 at 11:57
  • easier to run mimeopen -d / and pick Dolphin from the list
    – ewanm89
    Mar 17, 2021 at 12:32

As user162413 stated, kmozillahelper is no longer avaliable. His solution however did not work for me.

Instead, one from dragly did the trick:

Open up /usr/share/applications/defaults.list and change line




Works without need to restart Firefox.

  • Didn't work for me either. Is there another possible solution? Aug 18, 2015 at 19:29
  • Not working as well. Can you please post the version of OS and application?
    – Tik0
    Oct 6, 2015 at 11:44
  • this is the correct answer 16.04 LTS -- works for me Oct 19, 2018 at 18:47

To get Dolphin in the file-picker dialog, install the package "kmozillahelper" from the standard repositories.

sudo apt-get install kmozillahelper

Set the filepicker-variable in in Firefox by visiting the URL about:config.

More information here

  • 3
    The More Information link is dead.
    – alpha1
    Apr 27, 2015 at 16:47
  • 1
    As is the package itself: E: Unable to locate package kmozillahelper.
    – Neinstein
    Jun 15, 2020 at 6:43

For those still having this issue, I found a slightly easier way:

  1. Open the Default Applications control module (KDE menu -> search for Default)
  2. Select the File Manager list
  3. Ensure that Dolphin is selected
    • if it is already selected, reselect by clicking on another option then back to Dolphin
  4. click Apply
  5. test

This worked for me. YMMV, but this would be a much better solution rather than editing the MIME configuration manually.

  • 1
    Did not work me, Firefox still uses Gnome Files :-/
    – oulenz
    Jul 25, 2017 at 10:59
  • This worked for me, running KDE on Ubuntu 20.4.
    – Matthew
    Sep 27, 2021 at 12:07

After installing Firefox in Kubuntu there was not default file manager associated with the browser.

  1. Pressing the grey/green "Display the progress of ongoing downloads" arrow, just next to the search engine box in the head (right hand/top) of the browser (my Firefox version is 25.0.1), "Show All Downloads" menu was displayed.

  2. When I pressed it "Library" window opened and I pressed on "Open Containing Folder" button.

  3. Then "Launch Application" dialogue pops up with "Choose an Application" suggestion.

  4. Pressing "Choose..." I selected /usr/bin/ as folder and chose dolphin as the program. Dolphin can be selected as default application using the check box.

By the way - trying to install kmozillahelper in Kubuntu I got "E: Unable to locate package kmozillahelper". That's right - it's not available any more.

  • 1
    Well... The problem is if firefox is already assigned a program, then you won't get the "Choose an application" suggestion
    – Anwar
    Nov 15, 2016 at 7:01

A workaround that worked for me was to set MOZ_USE_XINPUT2=1 when launching Firefox.


I had a similar problem. Installing KDE for Ubuntu and Firefox not using Dolphin. The only thing that worked for me was uninstalling Nautilus and everything GNOME related completely.

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