One-Click Case Law: A Browser Extension for Instant Citation Lookup

[rlfordon]

Here's a start from the template:

Headline

One-Click Case Law: A Browser Extension for Instant Citation Lookup

What is the Feature?

A Firefox/Chrome extension that lets users instantly retrieve case law by entering a legal citation manually or selecting one in the text they are reading. The extension uses the CourtListener citation lookup API to fetch the case and display it immediately in the browser, eliminating extra steps and login barriers.

What Problem Might it Solve?

Currently, finding a case from a citation is a tedious process, even for people with access to expensive databases:

• Westlaw/Lexis Alternative: Users must open the website, log in (often with multiple steps), enter the citation, sift through results, and then read the case.
• Even with CourtListener: Users need to navigate to the CourtListener homepage, find the citation lookup page (unless bookmarked), enter the citation, and then view the case.

This extension removes all those extra steps. With a single click or selection of text, users can instantly access case law—without switching tabs, logging in, or navigating through menus.

Describe a Scenario in Which the Feature Might be Used

• Law student: While reading an article, they see a case citation. Instead of manually searching, they highlight the citation, right-click, and instantly see the case.
• Journalist: Verifying legal references in an article is seamless—no need for multiple logins or searching databases.
• Lawyer: Reviewing legal blogs, they quickly check cited cases without breaking focus or losing workflow.

Technical Requirements

• Difficulty: I don't know! (ChatGPT said "Medium")
• Estimated Time: Also don't know. (ChatGPT said 3-6 weeks)
• Technical Requirements:
  • Develop a Firefox/Chrome extension with context menu and manual input features
  • Implement text selection recognition for citations
  • Integrate with the CourtListener API for case retrieval
  • Display case law in an embedded viewer or a new tab
  • Design an intuitive UI for easy citation input and results

Existing Systems or Alternatives?

• Westlaw/LexisNexis – Require logins, multiple clicks, and potential search refinement. Paid services.
• CourtListener (without this extension) – Users must navigate to the site, find the citation lookup page, enter the citation, and retrieve the case.
• Other Legal Research Tools – Jurisage MyJr is a Chrome extension that does this (using CourtListener among other sources) but it's a little buggy for United States. Midpage used to have a Chrome extension that did this, but it doesn't appear to be active anymore. There is also a mac osx app called Case Viewer that attempts to do this with an app (albeit, extremely pretty and with lots of extra features)
• Google Scholar Button does something similar of what I'm thinking of for academic articles.

Any Additional Information?

• Future enhancements could include bookmarking cases, search history, and PACER integration for more comprehensive legal research.
• This tool could be particularly useful for journalists, students, and lawyers who need quick case lookups without breaking their workflow. I hear complaints from lawyers CONSTANTLY about how they just want to read the case and it takes too long on Westlaw (part of this is them not understanding what they need to enter but I digress)

[mlissner]

Interesting. A couple little thoughts:

1. There used to be an extension that just linkified citations on webpages. I don't know what happened to that, but as a user, does that feel better than having to highlight?

2. It is possible to add this into the RECAP extension. I think the trick if we did that would be to have people opt into it because otherwise we'd have to expand the permissions for everybody using it.

   I like the idea of the RECAP extension becoming a more useful tool though. It also fits in with adding bad redaction detection to some extension.

3. I don't think the most basic part of this is hard. Claude will make you an entire extension these days if you ask it to and spec it out in detail. As an experiment, I uploaded CL's API documentation and your description and it seemed to work. Unfortunately, Claude doesn't let you share chats, but it seemed to basically work.

[rlfordon]

Thanks for these comments! Yes linkified and/or highlighted citations would probably be better from a user perspective, and that is how I've seen the other products do it.

It would be neat if it were part of the RECAP extension, though then it might need new branding.

[anseljh]

I love it!

I was also trying to remember similar browser extensions, and I came up with Jureeka (closest) and Bestlaw (enhances Lexis & Westlaw interfaces).

You could also do this for statutes, and send people to LII.

Can extensions re-request different permissions? If yes, RECAP could request its current scope to start, and then it could request additional permissions if the user opted in to linkification.

Here's an additional idea that needs more work: could we look at the Referer header from clicks based on this extension? This would tell us where cases are being discussed online. One neat thing this could power is backlinks to news stories that discuss opinions. There may be compelling reasons to not do this, since we are very thoughtful about what kind of logs we keep at all and for how long, but it might be worth a discussion. (Perhaps we'd have a list of known news sources, link any hits from them, and otherwise discard the info.)

[mlissner]

There's an underused feature of extensions which lets you prompt for permissions when people turn on certain features. So we could roll out this feature without any permissions changes and when people turn it on, the extension would ask for more permissions.

Don't know about referers these days. They've gotten a lot more scarce since sites can now turn them off (we do, for example).

For our visualizations, we monitor where they are embedded and try to get the title of the page. Similar idea, but visualizations never had much traction.

Another idea is trying to capture citations we don't already have. I think BestLaw did that, but it could make for another useful source of data, particularly if we decide to gather data from every page users go to.

[rlfordon]

I bet Jureeka is what I was thinking of!

[legaltextai]

you can achieve smth similar already with google scholar extension (need to choose 'case law' in the extension settings first).

but it 's not always perfect.

i could add this functionality to CL extension but asking users to add two api keys (openai and courtlistener ones) might be a bit cumbersome. why not to make citation lookup no-api-key option?

[legaltextai]

vlex extension