Calculate and validate checksums
This extension allows you to validate checksum of files without downloading. Extension requires a getsum server to be available.
See a simple listen/server example at:
Extension also allows you to use 127.0.0.1 / localhost ports.
On top right, click Getsum icon -> select options
keep proxy empty (proxy for telling server to use it for reaching file)
set timeout (server will use timeout to download and calculate)
and save and restart browser
Then on any page right click on a download link and select GetSum then select desired algorithm.
If you want to validate checksum of download file then first select text on the page and right click on download link and select Getsum->algorithm so extension will check if any selected text exist and if it is valid it will use it for comparation.
Addons just validates checksum so they are informative, even it is valid still you need to download file. If you use self signed/untrusted certificate on server still you need to convince browser to allow this certificate
icon credit: https://www.flaticon.com/authors/freepik