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Re:Local PDF Tools – Powered by WebAssembly by boustrophedon on Wednesday March 03, 2021 @12:42AM (#26325197)
You can load the website and then disable the network, either by turning off the connection in your OS or via File -> Work Offline in Firefox.

I just did this and it worked.

Re:Local PDF Tools – Powered by WebAssembly by travis729 on Wednesday March 03, 2021 @04:53PM (#26335188)
Good tip. Though it would be nice to be able to disable network activity per tab.