NoScript is Free Software (source code): if you like it, you can support its progress :)

Stable AMO Version, see changelog for details.

Cross-browser NoScript on the chrome web store

Supported browsers: Firefox (Desktop and Mobile on Android), SeaMonkey, Tor Browser (where it is built-in), Chromium/Chrome.
Other browsers based on Gecko versions >= 45 might work, but are not tested.

Direct download

You can get latest stable version here, too, using this direct download link for NoScript 11.0.3
To install, just drag and drop it onto your address bar.

v 11.0.3
=============================================================
x [Tor] Work-around for prompts being huge when
  resistFingerprinting is enabled
x [XSS] Fixed false positives due to overzealous HTML
  attribute checking
x [XSS] Enabled InjectionChecker logging when debugging mode
  is on
x Work-around for browser.i18n.getMessage() API in content
  scripts giving away browser's real locale (Tor issue #31287)
x Updated TLDs
x [L10n] Updated Transifex-managed he, is, nb, ru, sq, zh_TW

If you find any problem installing it, this FAQ may help.

You can still download NoScript "Classic" (5.1.9) for Palemoon, Seamonkey, Waterfox and possibly other "vintage" (pre-Gecko 57) Firefox forks here: we'll do our best to provide security fixes as long as supporting browser still guarantee their own security updates.

Notice: you may need to open about:config and set your xpinstall.signatures.required preference to false in order to install NoScript 5.x, since Mozilla doesn't support signatures for legacy add-ons anymore. If you're using a non ESR Firefox, you may also need this hack.

v 5.1.9
=============================================================
x Fixed automatic reload bug (thanks ThomasW and barbaz for
  reporting)

Users of Firefox 44 and below are urged to upgrade their very unsafe browser. For those few who can't,

• latest NoScript version compatible with Gecko 46 - Gecko 56 is 5.1.x;
• latest NoScript version compatible with Gecko 13 - Gecko 45 is 2.9.0.14;
• latest NoScript version compatible with Gecko 1.9 - Gecko 12 is 2.9.0.1rc1;
• latest NoScript version compatible with Gecko < 1.9 is 1.10.

Development version

If you're brave enough and you need a specific feature or fix not released yet, or you simply want to provide feedback before official release, you may want try this
"Quantum" NoScript 11.0.3rc3 development build

Here, if you need it, the "Classic" NoScript 5.1.9rc1 development build for browsers based on Gecko 56 and below. Please notice you may need to open about:config and set your xpinstall.signatures.required preference to false in order to install, since Mozilla doesn't support signatures for legacy add-ons anymore.

Starting with NoScript 10.1.8.3, NoScript's public source code repository is hosted on Github.

v 11.0.3rc3
=============================================================
x Updated TLDs
x [L10n] Updated Transifex-managed he, is, nb, ru, sq, zh_TW

v 11.0.3rc2
=============================================================
x [Tor] Work-around for prompts being huge when
  resistFingerprinting is enabled
x [XSS] Fixed false positives due to overzealous HTML
  attribute checking
x [XSS] Enabled InjectionChecker logging when debugging mode
  is on

v 11.0.3rc1
=============================================================
x Updated TLDs
x Work-around for browser.i18n.getMessage() API in content
  scripts giving away browser's real locale (Tor issue #31287)

Feedback

If you find something wrong about NoScript, read the FAQ page and/or let me know: I'll try to fix it as soon as I can.

You can also discuss about NoScript on this Forum.

Have your safest browsing experience!