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 11.2.4
To install, just drag and drop it onto your address bar.

v 11.2.4
============================================================
x CSS resources prefetching as a mitigation against CSS PP0
  (https://github.com/Yossioren/pp0)
x [L10n] Updated br, de, el, es, fr, he, is, nl, pl, pt_BR,
  ru, sq, tr, zh_CN
x [nscl] Inteception of webgl context creation in
  OffscreenCanvas too
x Fixed configuration upgrades not applied on manual updates
  (thanks Nan for reporting)
x Mitigation for misbehaving pages repeating failed requests
  in a tight loop
x [UI] More understandable label for the cascading
  restrictions option
x [nscl] More refactoring out in NoScript Commons Library
x [nscl] patchWindow improvements

You can still download NoScript "Classic" (5.1.9) (SHA256) 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 5.1.9 (SHA256);
• latest NoScript version compatible with Gecko 13 - Gecko 45 is 2.9.0.14 (SHA256);
• latest NoScript version compatible with Gecko 1.9 - Gecko 12 is 2.9.0.1rc1 (SHA256);
• latest NoScript version compatible with Gecko < 1.9 is 1.10 (SHA256).

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 11.2.5rc1 development build

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

Recent development history:

v 11.2.5rc1
============================================================
x Configurable "csspp0" capability to for sites where the
  CSS PP0 mitigation should be disabled (e.g TRUSTED)
x [nscl] Fix CSS PP0 mitigation still interfering with some
  WebExtensions (thanks barbaz for report)
x [XSS] Increased sensitivity and specificity of risky
  operator pre-checks

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!