This Chrome extension computes checksums of downloaded files and compares them with checksums found in the download pages. The initial version of the extension used to perform the experiments described in [1] can be found here.
[1] - Mauro Cherubini, Alexandre Meylan, Bertil Chapuis, Mathias Humbert, Igor Bilogrevic, Kévin Huguenin. Towards Usable Checksums: Automating the Integrity Verification of Web Downloads for the Masses. 25th ACM SIGSAC Conference on Computer and Communications Security (CCS), 1256–1271, 2018.
Checkout or download the repository. In the extension tab of Chrome, activate developer mode and load the extension by clicking on the Load unpacked button and selecting the folder where the extension was unzipped.