SEI++ Firefox

Download SEI++

Download SEI++ (current and past versions) for Firefox
Latest Version: 6.0 Updated: 10 months ago

Ready to install?

SEI++ is available to install from Firefox Add-ons Store and for download from this page.
View source code
5,396
Daily users
4.5
85 ratings
1
Total downloads

Available versions

You can find the current and older versions of SEI++ here. You can download the archived versions or inspect their source codes.

As a free user, you can download up to 3 latest versions.
Upgrade to download older versions
VersionDownloadSizeDownload countTimestamp
6.0XPI · ZIP · Source code4.83MB12025-08-28
5.999XPI · ZIP · Source code2.55MB02025-08-27
5.99.2XPI · ZIP · Source code2.57MB02025-07-29
5.99.1Paid users only2.57MB02025-07-03
5.1.1Paid users only383.80KB02022-10-03
5.1Paid users only383.83KB02022-09-30
5.0.0Paid users only383.23KB02022-09-05
4.8.3Paid users only372.58KB02022-06-23
4.3.1Paid users only160.02KB02020-09-22
6.0 4.83MB
2025-08-28 · 1 downloads
XPI ZIP Source code
5.999 2.55MB
2025-08-27 · 0 downloads
XPI ZIP Source code
5.99.2 2.57MB
2025-07-29 · 0 downloads
XPI ZIP Source code
5.99.1 2.57MB
2025-07-03 · 0 downloads
Paid users only
5.1.1 383.80KB
2022-10-03 · 0 downloads
Paid users only
5.1 383.83KB
2022-09-30 · 0 downloads
Paid users only
5.0.0 383.23KB
2022-09-05 · 0 downloads
Paid users only
4.8.3 372.58KB
2022-06-23 · 0 downloads
Paid users only
4.3.1 160.02KB
2020-09-22 · 0 downloads
Paid users only

Install XPI file

An XPI file, short for "XPInstall," is a compressed file format used primarily by Mozilla applications, like Firefox and Thunderbird, to distribute and install add-ons or extensions. These files are similar in function to CRX files for Chrome but cater to the Mozilla ecosystem.
  • Simply drag-and-drop the XPI into Firefox to install the add-on.

Install ZIP file

  • Download the SEI++ ZIP file.
  • In Firefox browser, go to about:addons to open Add-ons Manager
  • Click on ⚙, Install Add-on From File
  • Select the SEI++ ZIP file from step 1. SEI++ is now installed on your browser.

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