Strict Pop-up Blocker from Nikos Asimakis is a Firefox extension that enforces a stricter pop-up policy than the browser's default, reducing unexpected new-window interruptions. The tool focuses on decisive suppression of intrusive windows while keeping a minimalist, no-configuration interface and a very small memory footprint. It is aimed at privacy-conscious Firefox users who consider built-in protections too permissive and who want a low-maintenance way to limit exposure to aggressive advertising and malvertising scripts across desktop and mobile browsing.

How strictly does the extension stop script-triggered new windows?

The extension operates at the JavaScript call level by intercepting window.open() attempts and preventing the browser from opening those new windows while active. This behavior enforces a categorical block rather than selectively allowing windows based on interaction heuristics. It intercepts all window.open() JavaScript calls, which targets the specific class of script-driven launches that sometimes bypass native pop-up protections.

Can it handle other ad formats or malvertising tactics?

The tool reduces exposure to aggressive marketing scripts and malvertising chains that rely on window creation, acting as a barrier at the window-launch vector. It does not claim to remove in-page overlays or floating banners, so pairing it with a dedicated content blocker is necessary to address those formats. The extension therefore complements, rather than replaces, ad-blocking and content-filtering measures.

What is the performance footprint and how hard is it to use?

The extension is designed for a negligible runtime footprint, reported at approximately 10 KB, and it has no background process overhead. Installation adds a toolbar control for immediate toggling and a visual indicator that shows whether blocking is active. Compatibility covers desktop and Android Firefox builds. User feedback highlights the simple, single-purpose approach and low operational friction.

A focused, pragmatic option with a clear operational trade-off

Strict Pop-up Blocker is a precise option for privacy-conscious Firefox users who need categorical control over window-opening behavior. The extension’s design trades per-site convenience for firm suppression, so users who require occasional trusted pop-ups must accept manual toggling. For those prioritizing predictable, interruption-free browsing and reduced exposure to script-driven pop-ups, it provides a dependable, low-maintenance choice.