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dezoomify-extension
A browser extension to detect zoomable images in web pages and downloading them with dezoomify
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I've taken a quick look at some of the Wayback links other people posted. It seems they used some sort of "image zooming software" on the website, which is pretty common for sites like this (Ancestry and FamilySearch do the same thing). This is what would have made it hard to save the letters originally, as it doesn't just load the jpeg file, instead it progressively loads areas as you zoom into them. I've had success in using dezoomify plugin on Firefox to get around this (also on Chrome), see: https://github.com/lovasoa/dezoomify-extension
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YSK: There’s a website available for free that will instantly get you into paywalled sites. No browser extensions needed.
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Show HN: I made a CLI tool to create web extensions with no build configuration