Chrome //
Extensions 
Chrome
Web store
select chrome_id_no,plugin_tag_line,plugin_name,plugin_icon,sitemap_url,oldvsnew_comment from final_chrome_totaldata_sept2022 where MATCH(plugin_name) AGAINST('+digital +signature' IN Boolean MODE) order by users desc
Signer.Digital Digital Signature, PKI
Digital Signature of eReturns, PDF & Web User Auth, RSA Encryption/Decryption, Certificate Enrollment/Download on Smartcard.
FEPWeb CMS Digital Signature Extension
This extension is used to digitally sign documents with digital certificates.
Digital Signature for PDF Files
Create beautiful signature with ease and optionally put in a PDF file.
Secured Signing - Secure Digital Signature
Securely Send Your Documents For Digital Signing From Within Google Docs + Google Drive. 3 Documents/Month Free!
Monachus Digital Signature Extension
PKI Based Digital Signatures using RSA Keys on Smart Cards/Tokens.
Apia digital signature
This extension allows Apia to access Java applications required to digitally sign content.