Browser Content Script Blacklisting via Segmented Sandboxes
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Solution Overview
Problem
Browser extensions that utilize content scripts pose a security risk by potentially accessing confidential user data and requiring trust across all visited webpages, leading to undesirable interactions and compromised data privacy.
Innovation Solution
Implementing a system with a content script manager that evaluates pages using a blacklist or whitelist before allowing execution, creating separate execution environments for content scripts and page scripts to prevent unauthorized access and ensure secure rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If content scripts are allowed to interact with all webpages, then extension functionality is enhanced, but security risks increase due to potential access to confidential user data
Solution Approach 1:
The patent segments the execution environment into separate sandboxes for content scripts and page scripts. Content scripts execute in a restricted sandbox that limits their access to webpage data and APIs, while page scripts execute in the full browser environment. This segmentation allows extensions to function across multiple websites while containing security risks within isolated execution contexts, preventing unauthorized access to confidential user data.
Solution Approach 2:
The patent introduces a content script manager as an intermediary component between extensions and webpages. This manager evaluates whether a content script should execute on a given webpage based on predefined criteria (whitelist/blacklist mechanisms), and controls the injection and execution of content scripts through a managed interface. The intermediary layer provides controlled access, enabling extension functionality while filtering out potentially harmful interactions with webpages.
2Adaptability or versatility
If content scripts access all webpage data, then extension capabilities are improved, but data privacy is compromised
Solution Approach 1:
The patent applies local quality by providing different levels of data access to different execution contexts. Content scripts receive limited, localized access to specific webpage elements and data through a controlled API interface, rather than unrestricted access to all webpage data. The sandboxed environment ensures that content scripts can interact with webpage data only in the specific contexts permitted by the extension manager, preserving data privacy while maintaining necessary extension capabilities.
3Speed
If content scripts are executed without evaluation, then rendering speed is improved, but system stability decreases due to potential disruptions
Solution Approach 1:
The patent implements preliminary action by evaluating and pre-checking content scripts before they are injected into webpages. The content script manager assesses whether a content script should execute on a given webpage based on whitelist/blacklist criteria and compatibility checks, preparing the execution environment in advance. This preliminary evaluation prevents potentially disruptive or incompatible content scripts from executing, maintaining system stability while allowing approved scripts to render quickly without repeated runtime checks.
Data Source
AI summary
A rendering engine may be configured to execute, within a execution environment, a page script of a page to be rendered within a browser interface, the page script configured to interact with a page model to implement the rendering. An extension manager may be configured to execute an extension file which modifies a functionality of a browser application in association with the rendering of the page, including detecting a content script associated with the extension file which, during execution, interacts with the page model. An environment manager may be configured to evaluate the page, for example using a blacklist, prior to execution of the content script by the rendering engine.