WebPG is a available for Mozilla Firefox, or Google Chrome/Chromium. Please use the appropriate link below to install the extension.
Mozilla Firefox, SeaMonkey, Thunderbirdwebpg-firefox is available in the Mozilla Add-ons Gallery: https://addons.mozilla.org/en-US/firefox/addon/webpg-firefox/
Current source code for webpg-firefox can be found here: https://github.com/kylehuff/webpg-firefox
Google Chrome/Chromiumwebpg-chrome is available in the Google Chrome Webstore: https://chrome.google.com/webstore/detail/webpg/hhaopbphlojhnmbomffjcbnllcenbnih
Current source code for webpg-chrome can be found here: https://github.com/kylehuff/webpg-chrome
WebPG provides an interface to GnuPG by way of an NPAPI plugin, which is compatible on Windows, Linux and OSX within any browser supporting NPAPI plugins. There are 2 separate binary distributions for each platform+architecture; The binary, and the extension only binary - The extension only binary utilizes a compile-time flag that prevents the plugin from being loaded on a page that was not provided by, or hosted within a browser extension.
NOTE: Unless you are a developer needing to integrate GnuPG into an application, you do NOT need to download any of the below binaries. The NPAPI interface is bundled within the Browser Extensions available above.
Binary Distribution
Mac OSX (Darwin)
OSX Universal Binary - webpg-npapi v0.6.1 - MD5: aac7949e5399e2f247de03386d2485f9
OSX Universal Binary (extension use only) - webpg-npapi (ext-only) v0.6.1 - MD5: 54e997590293618c153296e47cd79788
Linux
Linux 32bit Binary - webpg-npapi v0.6.1 - MD5: 29fde3da917886562abef5c682675baa
Linux 32bit Binary (extension use only) - webpg-npapi (ext-only) v0.6.1 - MD5: eec768fecb7d77a700cb89ece86f4dd6
Linux 64bit Binary - webpg-npapi v0.6.1 - MD5: 6444a7332a89768f2d61e48c984c9bfa
Linux 64bit Binary (extension use only) - webpg-npapi (ext-only) v0.6.1 - MD5: 800323e1d6776d45286da40841996a7a
Windows
Windows 32bit Binary - webpg-npapi v0.6.1 - MD5: 2affdaab4626702853bd084d843a7cb8
Windows 32bit Binary (extension use only) - webpg-npapi (ext-only) v0.6.1 - MD5: 641473737bcba203dfcb8752c9983008
Source CodeCurrent source code for webpg-npapi can be found here: https://github.com/kylehuff/webpg-npapi