Simple Tampermonkey userscript that adds an inverted colour overlay to both local PDFs and PDFs hosted on the internet.
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Install Tampermonkey
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Click this link and click 'Install'
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Go to
chrome://extensions
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Click on the 'Details' button for the Tampermonkey extension
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Enable 'Allow access to file URLs' in order for the extension to work on local PDF files on your computer.