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 11.0.9
To install, just drag and drop it onto your address bar.

v 11.0.9
============================================================
x [Chromium] Prevent duplicated MSE placeholders (e.g. on
  Youtube)
x Fixed external scripts included in HEAD of file:// pages
  failing (issue #115)
x [XSS] Updated HTML 5 events inventory
x Best effort to make media placeholders visible and
  clickable
x Placeholders for MSE on Chromium too
x Use invalid IP rather than domain name to prevent offline
  status from breaking sync messaging in Chromium
x Removed empty exportFunction() Chromium shim
x Updated TLDs

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 11.0.10rc1 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.

Recent development history:

v 11.0.10rc1
============================================================
x Updated TLDs
x Fixed scripts could not be enabled on file: SVG documents

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!