Disable the Selection API

Name: Disable the Selection API
Author: Turistu

By: Turistu

(partially) disable the Selection API from a content script via exportFunction()

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Install

Features & Capabilities

disable parts of the Selection API which could be used to pastejack you (and execute arbitrary code on your machine) while using firefox on an X11 system.

see https://github.com/turistu/odds-n-ends/blob/main/firefox/pastejack.md#workaround

WARNING: this will break a lot of sites, including discussions in github.

OF COURSE, this does NOT access any of your data on any website. It's just that firefox's permissions are totally retarded. This temporary kludge may be broken or pointless, but one thing it's certainly not: it's not "accessing" any of your data.

User Growth & Download Statistics

Add-on

By:

Turistu

Daily users:

Version:

0.0.0.2 Last updated: 2023-10-17

Version code:

5637814

Creation date:

2023-10-15

Risk:

Permissions:

*://*/*

Content scripts matches:

<all_urls>

Size:

7.86KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-20

Compare stats and ranking:

Ranking

# 116,610 ▲ 2,177

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Contact the developer

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Developed by:

Turistu

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/disable-the-selection-api/

Is Disable the Selection API Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Disable the Selection API requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Disable the Selection API is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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