ProxyMust – Proxy Checker & Manager Firefox

Download ProxyMust – Proxy Checker & Manager

By: nana.xakep Add-on
Download ProxyMust – Proxy Checker & Manager (current and past versions) for Firefox
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Modify request and response headers. No ads, no malware.
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Latest Version: 1.0.8 Updated: 15 days ago

Ready to install?

ProxyMust – Proxy Checker & Manager is available to install from Firefox Add-ons Store and for download from this page.
View source code
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Available versions

You can find the current and older versions of ProxyMust – Proxy Checker & Manager 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
1.0.8XPI · ZIP · Source code4.06MB02026-08-22
1.0.7XPI · ZIP · Source code4.05MB02026-08-12
1.0.6XPI · ZIP · Source code4.04MB02026-08-06
1.0.5Paid users only4.00MB02026-07-13
1.0.4Paid users only4.01MB02026-07-07
1.0.3Paid users only4.00MB02026-06-26
1.0.2Paid users only3.97MB02026-06-21
1.0.8 4.06MB
2026-08-22 · 0 downloads
XPI ZIP Source code
1.0.7 4.05MB
2026-08-12 · 0 downloads
XPI ZIP Source code
1.0.6 4.04MB
2026-08-06 · 0 downloads
XPI ZIP Source code
1.0.5 4.00MB
2026-07-13 · 0 downloads
Paid users only
1.0.4 4.01MB
2026-07-07 · 0 downloads
Paid users only
1.0.3 4.00MB
2026-06-26 · 0 downloads
Paid users only
1.0.2 3.97MB
2026-06-21 · 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 ProxyMust – Proxy Checker & Manager ZIP file.
  • In Firefox browser, go to about:addons to open Add-ons Manager
  • Click on ⚙, Install Add-on From File
  • Select the ProxyMust – Proxy Checker & Manager ZIP file from step 1. ProxyMust – Proxy Checker & Manager is now installed on your browser.

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