Operating system: Windows 7 SP1 64-bit
Browser version: Pale Moon 33.8.1.1 sse2
32-bit or 64-bit browser?: 64
Installed plugins: (about:plugins): SumatraPDF Browser Plugin (npPdfViewer.dll v2.5.2.0)
Аfter Pale Moon update to 33.8.1.1 the SumatraPDF plugin stopped working - only a blank screen is shown when trying to view online PDF's.
There's no errors or any messages in the console. The same thing happens on a clean profile.
However everything returns to normal when rolling back Pale Moon to 33.8.1 or earlier.
Problem with PM 33.8.1.1 and SumatraPDF plugin
Moderator: trava90
Forum rules
This board is for technical/general usage questions and troubleshooting for the Pale Moon browser only.
Technical issues and questions not related to the Pale Moon browser should be posted in other boards!
Please keep off-topic and general discussion out of this board, thank you!
This board is for technical/general usage questions and troubleshooting for the Pale Moon browser only.
Technical issues and questions not related to the Pale Moon browser should be posted in other boards!
Please keep off-topic and general discussion out of this board, thank you!
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_yuyu_
- Lunatic

- Posts: 265
- Joined: 2015-03-02, 14:18
Problem with PM 33.8.1.1 and SumatraPDF plugin
Pale Moon 64-bit on Win 7 x64
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Gemmaugr
- Lunatic

- Posts: 422
- Joined: 2025-02-03, 07:55
Re: Problem with PM 33.8.1.1 and SumatraPDF plugin
This is a known issue with the current 33.8.1.1 version, and will be fixed shortly: viewtopic.php?f=3&t=32609
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Ghostwalker
- Moongazer

- Posts: 12
- Joined: 2016-03-03, 13:05
Re: Problem with PM 33.8.1.1 and SumatraPDF plugin
The Pale Moon PDF Viewer plugin works for 33.8.1.2 with no issues.
I tried a 975 page 164 MB personal pdf I had that loaded instantly.
Here's an online pdf vetted by virustotal that opens in Pale Moon:
https://www.virustotal.com/gui/url/ef7c ... 03845acb6a
Online pdf:
https://freetestdata.com/wp-content/upl ... KB_PDF.pdf
Add-on:
https://addons.palemoon.org/addon/pdf-js-for-seamonkey/
I tried a 975 page 164 MB personal pdf I had that loaded instantly.
Here's an online pdf vetted by virustotal that opens in Pale Moon:
https://www.virustotal.com/gui/url/ef7c ... 03845acb6a
Online pdf:
https://freetestdata.com/wp-content/upl ... KB_PDF.pdf
Add-on:
https://addons.palemoon.org/addon/pdf-js-for-seamonkey/
Browser: Pale Moon AVX2, Ungoogled Chromium, Mullvad Browser
Operating System: MX-Linux Installed on every machine
Triple boot: Windows 7, 10 and MX-Linux
Windows 2000, XP, 7, 8.1, 10 and 11 Virtual Machines
Testing different BSD's in Virtualbox
Laptops: HP ZBook, an Acer and a dinosaur Gateway
PC's: Dell XPS 8700, Dell OptiPlex 7020,
Lenovo IdeaCentre K450
Operating System: MX-Linux Installed on every machine
Triple boot: Windows 7, 10 and MX-Linux
Windows 2000, XP, 7, 8.1, 10 and 11 Virtual Machines
Testing different BSD's in Virtualbox
Laptops: HP ZBook, an Acer and a dinosaur Gateway
PC's: Dell XPS 8700, Dell OptiPlex 7020,
Lenovo IdeaCentre K450
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Gemmaugr
- Lunatic

- Posts: 422
- Joined: 2025-02-03, 07:55
Re: Problem with PM 33.8.1.1 and SumatraPDF plugin
As an aside, and for those that want limit the google influence they use (yes, VirusTotal is sadly google), I use these instead:Ghostwalker wrote: ↑2025-08-05, 08:09Here's an online pdf vetted by virustotal that opens in Pale Moon:
https://www.virustotal.com/gui/url/ef7c ... 03845acb6a
https://polyswarm.network/
https://virusscan.jotti.org/
https://online.drweb.com/result2/
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Pelican
- Lunatic

- Posts: 276
- Joined: 2018-02-23, 06:51
Re: Problem with PM 33.8.1.1 and SumatraPDF plugin
I too am tracking PDF support and found that while PDF support was working in version 33.6 it failed for later versions. Then I found that it was working again in version 33.8.1.2... well done!
But when I download the latest source (version 33.9.0a1) the build from that is NOT working... it fails to display PDF embedded on a web page and also fails to display PDF opened as a file.
The current release seems to be 33.8.1.2... where can I find the source for that?
But when I download the latest source (version 33.9.0a1) the build from that is NOT working... it fails to display PDF embedded on a web page and also fails to display PDF opened as a file.
The current release seems to be 33.8.1.2... where can I find the source for that?
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Pelican
- Lunatic

- Posts: 276
- Joined: 2018-02-23, 06:51
Re: Problem with PM 33.8.1.1 and SumatraPDF plugin
I found the difference to be a PDF plugin that was installed with version 33.8.1.2 but not with earlier versions.

Is this part of source? How to include it in builds?

Is this part of source? How to include it in builds?