Sei!+ Firefox

Download Sei!+

By: Manoel
Download Sei!+ (current and past versions) for Firefox
Latest Version: 2.4.9 Updated: a month ago

Ready to install?

Sei!+ is available to install from Firefox Add-ons Store and for download from this page.
View source code
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1
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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
2.4.9XPI · ZIP · Source code48.70MB02026-06-01
2.4.6XPI · ZIP · Source code2.00MB12026-03-05
2.4.5XPI · ZIP · Source code2.01MB02026-02-26
2.4.4Paid users only2.01MB02026-02-19
2.1.3Paid users only2.00MB02025-12-22
1.7Paid users only4.23MB02025-12-11
1.6Paid users only4.23MB02025-11-06
1.3Paid users only4.23MB02025-10-30
1.0Paid users only4.22MB02025-10-08
0.2.15Paid users only4.21MB02025-10-07
0.2.13Paid users only3.07MB02025-09-11
0.2.11Paid users only3.05MB02025-09-04
0.2.10Paid users only3.05MB02025-08-22
0.2.8Paid users only2.89MB02025-07-24
0.2.7Paid users only2.89MB02025-07-12
2.4.9 48.70MB
2026-06-01 · 0 downloads
XPI ZIP Source code
2.4.6 2.00MB
2026-03-05 · 1 downloads
XPI ZIP Source code
2.4.5 2.01MB
2026-02-26 · 0 downloads
XPI ZIP Source code
2.4.4 2.01MB
2026-02-19 · 0 downloads
Paid users only
2.1.3 2.00MB
2025-12-22 · 0 downloads
Paid users only
1.7 4.23MB
2025-12-11 · 0 downloads
Paid users only
1.6 4.23MB
2025-11-06 · 0 downloads
Paid users only
1.3 4.23MB
2025-10-30 · 0 downloads
Paid users only
1.0 4.22MB
2025-10-08 · 0 downloads
Paid users only
0.2.15 4.21MB
2025-10-07 · 0 downloads
Paid users only
0.2.13 3.07MB
2025-09-11 · 0 downloads
Paid users only
0.2.11 3.05MB
2025-09-04 · 0 downloads
Paid users only
0.2.10 3.05MB
2025-08-22 · 0 downloads
Paid users only
0.2.8 2.89MB
2025-07-24 · 0 downloads
Paid users only
0.2.7 2.89MB
2025-07-12 · 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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