SeaMonkey Internet Suite

Unofficial News in English language

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PDF Viewer PDF.JS for SeaMonkey 2.53.1

PDF Viewer for SeaMonkey 2.1.288 does not work correctly with SeaMonkey 2.53 and 2.53.1 (By WG9S): endless idling in Browser-TAB until you click Stop Loading Icon, also problems when open PDF attachment from Mail.

There is a first experimental fixed version (by FRG) here, you can use it for tests on your own risk. Loading PDFs in browser window now works fine, loading PDF attachment from email still needs a refresh (browser tab contents) before PDF becomes shown.

More details and discussion on German Blog.


Add-on “Go Parent Folder” stopped working

As already mentioned in Unofficial SeaMonkey 2.53 by user wg9s and Test Results for Add-Ons from ca-archive, “Go Parent Folder” (and also “Show Parent Folder”) don’t work any longer with latest 2.53 by user wg9s

  • “Go Parent Folder” context menu appearing after rightclick on a bookmarks entry does no longer show  the Item “Go Parent Folder”, Problem is visible in Bookmarks Manager and in Sidebar Bookmarks Panel.
  • “Show Parent Folder”: Table column can no longer be added in Bookmars Manager.

Screenshot from Build 20170731233559

Go Parent Folder and Show Parent Folder both worked in Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0 SeaMonkey/2.53a1 Build 20170731233559. That was a version with the little column selector in the most right table heading in Bookmarks Manager.

The first version still available on my PC where both addons do no longer work is Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0 SeaMonkey/2.53 Build 20180902143701. And in this version also the little column selector in the most right table heading has gone. That proves nothing, but might indicate the reason why the addons do no lnger work.


Test Results for Add-Ons from ca-archive

Latest change 2020-04-05 16:00 { Empty Cache Button | Plain Text Link | pdfit [converted] 1.15.1 | Custom Buttons | Parent folder detection |  |  Color Tab |  Google Search by Image WebToPDF 12.11 | pdf creator 0.1.9 | PDF Download | EcosiaLinkChecker | PDF Mage1.0.3heavens-above | Save as PDF | R-kiosk }

Here I will publish results of (very) short tests of my tests for add-ons from Classic Add-ons Archive with SeaMonkey, until we will have found a better place.

  • 👎 Color Tab 0.2.3 [converted] by Wildsky  — I did not get it working with my SeaMonkey 2.53. Installation without problems, appears in Add-Ons-Manager, but does nothing (to be honest, I don’t know which effect can be expected from description ” … will let your boring new-tab page provide some beautiful color sets …”.
  • 👎 Custom Buttons [converted] by Yan, SCClockDr, cubegm
    has been working for me until 2.53.2 until I had to switch to a new User Profile because my old one had become damaged. Newly created Profile with newly converted Add-On shows error message in Status Bar:
  • 👍 Ecosia 3.4.5  [converted] — The search engine that plants trees!  (by Ecosia development team)
    Installation of the converted add-on adds Ecosia to Search Sidebar Panel as currently active search engine. The results of a small sample look very similar to DuckDuckGo, but I read that the results are from bing. The search engine is really useful for me. Here you find some hints on Wikipedia.
  • 👍 Empty Cache Button [converted] 2.7.1: Adds icon with Empty Cache function to navigation bar. (To be honest: I haven’t a clue how to check whether Cache really has become emptied)
  • 👎 YouTube2MP3 Converter has been working great for a while, but now the converter service page has become shut down for legal issues.
  • Go Parent Folder -signed1-signed (not from ca-archive!)
    👍 Worked for older SeaMonkey versions until 2.53 (beginning of 2019)
    👎 Does not work for latest unofficial SM 2.53
  • Link Checker 0.2d.1-signed.1-signed by ViJo
    currently I do not know whether that very old (2010!) add-on does work or does not.

  • 👍 I am using LinkChecker [converted] version by Kevin Freitas, which works fine. Unfortunately I do not know a source for it, the Web page is dead. May be you want to try download from

  • 👎 PDF Mage 1.0.3  (No Restart) by PDF Mage
    I did not get it working with my SeaMonkey 2.53, no button to start the PDF creation offered, also not when I tried to add one using context menu ‘customize’.

  • 👎 pdf creator 0.1.9
    Installation works fine after conversion, but I can’t find out how to use the add-on. I don’t find any new context menu entry, button or similar.
  • 👎 pdfit [converted] 1.15.1-signed.1-signed
    Installation works fine after conversion, but results for “save as PDF” are bad and save as picture does not work at all.
  • MeasureIt

    👍 MeasureIt 0.4.15 by Kevin Freitas: After conversion add-on installs and works fine with WIN SM2.53 (separate User Profile for tests). Creates a launch icon for the add-on in the SM Navigation Toolbar. After click on icon you can mark a rectangle on the screen, dimensions in px will appear. I haven’t a clue for what I should need that, but it works.

  • 👎 PDF Download
    Can not be used any longer with any browser, required infrastructure does no longer exist. hat become part of the Nitro Family.

  • 👍 Plain Text Links [converted]
    Opens selected (marked) plain text link in Browser window from context menu
  • R-Kiosk

    👍 R-kiosk by Kimmo Heinaaro
    After conversion add-on installs and works fine with WIN SM2.53 (separate User Profile for tests). After relaunch of SeaMonkey the browser will be in “Kiosk Mode”, no Menu Bar, no Navigation bar or similar is available. But it is not a perfect Kiosk, Sidebar is still active, so that Bookmarks, search and so on still can be used. May be you should disable Sidebar before relaunch?
    ⚠️ R-kiosk only can be disabled after SeaMonkey Browser has been launched in Safe mode.

  • Save as PDF Screenshot

    👍 Save as PDF 1.5.1-signed.1-signed by Pdfcrowd Team
    After conversion add-on installs and works fine with WIN SM2.53 (separate User Profile for tests). After relaunch of SeaMonkey the browser will show a Save as PDF — Icon at the right end of the navigation Toolbar. Works fine, PDF- results look very similar to source page, contain working hyperlinks, what makes those PDF documents much more useful that the output of printer solutions like FreePDF (my one might be outdated).
    But unfortunately there also are pages where the results of this add-on are completely unusable, for example Result here!

  • ❔ Show Parent Folder [converted] 2.1
    👍 Might work for older SeaMonkey versions
    👎 Does not work for latest unofficial SM 2.53

  • 👍 WebToPDF 12.11
    After conversion installation works fine. The add-on adds a new item to context menu for rightclick on web page contents with several sub items. I tested ‘Safe as PDF’, works fine. Result is only graphic, no text search, hyperlinks, … . For me that is not very useful. PDF export for this page see 190201_TestResultsForAddOnsFrom_ca-archive_ SeaMonkey InternetSuite! If such graphic export is all you need the tool offers a quick and simple solution.
    Unfortunately add-on does not work for me with 2.53.2!

  • 👍 Google Search by Image 0.3.1-signed.1-signed [converted] works fine. The add-on adds an Item to the context menu which appears when you click on an image on a web page. The search results differ a little from the ones Google Image Search does find, my tests were not intensive enough to tell whether there migt be an adventage for one of the add-ons. For the shown image i got this with Google Search by Image and this with Google Image Search.


For your own results please leave a comment including a link to a screenshot, I will move your results from Comment to this blogpost.


Rainer Bielefeld



Classic Add-ons Archive

One possible solution for the “Many old type Firefox addons lost!” — problem (all FF-CLASSIC-addons dropped from AMO without having moved them to new repository) might be the:

Classic Add-ons Archive

After some trouble I managed to install it to SeaMonkey, but I doubt that it works. I observed 10 minutes of database provisioning …  without visible progress. I hope it will be possible to fix that.

I will keep you up to date here.


SeaMonkey add-ons will be moved to

I received an e-mail from “The Thunderbird & Add-ons teams”:

” … Starting on July 12th, SeaMonkey add-ons will be listed on, which is the new home for Thunderbird and SeaMonkey add-ons. This new site is being run by the Thunderbird Council. If the add-ons also support Firefox or Firefox for Android, they will remain listed on AMO. Otherwise, their listings will be removed, and their URLs will redirect to the new site. Similarly, update URLs will be redirected, so all of your users will continue to receive automatic updates on the new site if you upload new versions to it. Your developer account will also be ported, so you should be able to log in and manage your listing.

If you come across any issues or need any support during this transition, please leave a comment on this Discourse thread.

If you don’t wish to be notified about these add-ons anymore, please disable the listing pages on the new site, and the old one, if needed”

I tested the new site, currently (as expected) still “503 Service Temporarily Unavailable”

May be we will have to adapt SeaMonkey Help, website, wiki, …. All that should be handled via Bugzilla as soon as the new site will be running.



Rainer Bielefeld

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Future home of Thunderbird and SeaMonkey add-ons

I received the cited message because I’m an add-on developer registered on AMO ( and because I have an add-on that supports Thunderbird or SeaMonkey.

Firefox Quantum (version 57) launched on November 14th, with exclusive support for add-ons using WebExtensions APIs. AMO is moving forward in parallel with Firefox, and its features will progressively focus on WebExtension add-ons rather than legacy add-ons. This poses a problem in the long term for applications like Thunderbird and SeaMonkey, which don’t have plans to support the new API (legacy add-ons for Firefox will continue to be supported until mid-2018).

In order to move forward while providing continuity to the existing Thunderbird and SeaMonkey communities, we will move Thunderbird and SeaMonkey add-ons to a separate site that can be operated by their communities. We are working with members of the Thunderbird Council to make sure this transition is as smooth as possible.

We begun the first phase of this transition a few weeks ago. All add-ons that support Thunderbird or SeaMonkey will be automatically ported to the new site during this phase. However, you should expect some features for your add-ons to be temporarily unavailable, like uploading updates or even public listings. If you don’t want to be part of this process, please disable your listing by signing in to and make your extension(s) invisible, or remove Thunderbird and SeaMonkey support for all versions of your add-on.

We will share more information about this process as we move forward.

I don’t know whether someone from SeaMonkey project is involved? We have a very old note in the Status Meeting minutes, but I doubt that we really are involved.

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AMO Browsing for SeaMonkey — Add-On information updated on AMO

This blog post in German languageSome of you might have observed that the add-on-page on AMO showed a message “not available for SeaMonkey 2.51” for a while. Actually the add-on installs and works fine, so I updated information, the add-on works fine also for latest Trunk version SeaMonkey 2.51a1.

If you observe a problem please use the support link on the add-on page.