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SeaMonkey User FAQ (Frequently Asked Questions)


  • This page is also available in other languages: German (Deutsch), Spanish (Español)
  • Since this is a Wiki page, anyone with an account can modify it. If you have questions of general interest but no answer yet, please add it to the Discussion page instead. Thanks!
  • The user-centric SeaMonkey Help website, run by Chris Ilias, provides screen casts and explanations for many SeaMonkey-related issues. Check it out!


What should I do before upgrading?
You can backup your profile, just to be safe. But normally the upgrade from one SeaMonkey version to another version will work flawlessly.
Is the upgrade from SeaMonkey 2.0 to 2.x as complicated as the upgrade from SeaMonkey 1.x to 2.0?
No. The upgrade from SeaMonkey 2.0 to 2.x will just convert your bookmarks (silently and only once). The rest is mostly left untouched. In contrast the upgrade to SeaMonkey 2.0 migrated (copied) the whole profile.
What happens if I go back to SeaMonkey 2.0 after the upgrade?
Due to incompatible changes to the Places back-end, you will lose your browsing history and any changes made to bookmarks. When you go back to SeaMonkey 2.x again, you may recover your bookmarks using Tools/Restore from the Bookmarks Manager, though.


Which version of Firefox does SeaMonkey 2.x correspond with?
SeaMonkey 2.1 uses the same back-end as Firefox 4.0, Gecko 2.0. Starting with Firefox 5, Gecko versions equal the Firefox version. While Firefox (and Thunderbird) chose to increment the major number with each new release, SeaMonkey chose to increment the minor number only. In other words, Firefox 5 corresponds with SeaMonkey 2.2, Firefox 6 with SeaMonkey 2.3 and so on.
I have a question/problem. Where can I get help?
First try searching the help contents (press F1 in SeaMonkey). If that doesn't answer your question, get help from our community.

Add-ons (Extensions)

Some of my add-ons are not compatible with SeaMonkey 2.x anymore. What can I do?
Install the Add-on Compatibility Reporter, or have a look at the AddonCompat page.
After installing Firebug 1.7.x, all toolbar buttons are gone except for the Firebug button. What can I do?
Click the toolbar with the right mouse button to open the context menu. Choose Customize, then Restore Default Set. (Note: This has been fixed in Firebug 1.8.0a3 which is available from
I need calendar integration. Which version of Lightning is compatible with SeaMonkey 2.x?
The recommended version is available from (AMO).
I need PGP/GPG integration. Which version of Enigmail is compatible with SeaMonkey 2.x?
The recommended version is available from (AMO).


I lost my bookmarks during the upgrade. What can I do?
  1. Open Help, Troubleshooting Information
  2. Click Open Containing Folder; remember/copy the location
  3. Open Bookmarks, Manage Bookmarks
  4. Open Tools, Import HTML; select File; click Next
  5. Navigate to the folder from (2.) above and select bookmarks.html
  6. Click Open.
The bookmarks.html file is not updated anymore. What can I do?
You can go to about:config and toggle the browser.bookmarks.autoExportHTML pref to true. Then bookmarks.html will be written each time you exit SeaMonkey. Or you can do it manually using Tools/Export HTML from the Bookmarks Manager.
What are the benefits of Places-based bookmarks?
Bookmarks are stored in a database now, together with your browsing history. This allows for better integration (Sync, the Location Bar and add-ons), automatic backups and the possibility to restore them, saving favicons with your bookmarks, and the ability to define tags.
Bookmarks in the Location Bar?
Yes. You can adapt the behavior using the browser.urlbar.default.behavior pref.
What happened to "Check this location for updates"?
This functionality is not available anymore, at least not out-of-the-box. You may try and install the CheckPlaces add-on instead.
What happened to groupmarks (clickable tab groups)?
Groupmarks have been converted to simple bookmarks folders, the contents of which can be opened in browser tabs using either the middle mouse button, Ctrl + click, or the Open All in Tabs menu item.


I don't want Zoom to remember its state per site. What can I do?
Go to about:config, search for browser.zoom.siteSpecific and toggle the value to false by double left clicking the result line.
I don't like Tabbed Browsing. What can I do?
Go to Preferences and change these settings:
  • Browser, Tabbed Browsing:
    • Hide the tab bar when only one tab is open
  • Browser, Link Behavior:
    • Open links meant to open a new window in: The current tab/window
    • When scripts want to open a new window: Always open new windows
    • Open links passed from other applications in: The Current tab/window
I'm getting a notification bar that reads "SeaMonkey prevented this page from automatically reloading." (or "SeaMonkey prevented this page from automatically redirecting to another page."). What can I do?
Go to Preferences, Appearance, Content and deselect the "Warn me when web sites try to redirect or reload the page" option.
I've set a Master Password, but now SeaMonkey asks for it every time I open the browser (start the application). What can I do?
It's not a bug, it's a feature. By default, SeaMonkey initializes MailNews in the background even if you just open the browser. This way it can check for new mail and notify you while you can start browsing right away and not be distracted too much by the MailNews window in case there is no new mail. You can disable this behavior by going to Preferences, Mail & Newsgroups and selecting "Only check for new mail after opening Mail & Newsgroups". Once you did that, the next time you restart SeaMonkey it will only start checking for new mail once you opened MailNews at least once during the browsing session.
The scrolling speed on Windows has changed. What can I do?
The scrolling speed can be configured through the Windows mouse settings. Many people do not know that, though. Starting with SeaMonkey 2.1, if you didn't change the Windows default, the scrolling of web pages has been changed to be twice as fast as before. If you want to revert that, go to about:config, search for "mousewheel.system_scroll_override_on_root_content.enabled" (without the quotes) and toggle the pref to false by double clicking the result line.
Middle-clicking a tab does not close it. Instead, the location bar changes! What can I do?
You are probably on Linux. Some settings depend on the platform, and on Linux the middle mouse button is commonly used for pasting what is currently on the clipboard. To change the behavior for SeaMonkey, go to about:config, search for "middlemouse.contentLoadURL" (without the quotes) and toggle the pref to false by double clicking the result line.


I cannot create a new account. What can I do?
See bug 521861 comment 0 for a workaround.
The MailNews status bar is broken. What can I do?
This can be caused by incompatible add-ons that seem to otherwise work fine. One example is Mailbox Alert 0.14.5, which is really only compatible with SeaMonkey 2.0.


The new Data Manager doesn't show for which sites I have cookies or passwords stored. What can I do?
For passwords, see Ed Mullen's Password Viewing or use the Saved Password Editor add-on. For cookies, try the CookieSafe add-on.