Web browser script monitoring

A method for securing a web browser, the method comprising:

• parsing, by the web browser, web content received from a server, wherein the web browser is executed by a client computing device;
• identifying, by the web browser, a script associated with the web content received from the server;
• generating, by the web browser, script fingerprint data for the script, wherein the script fingerprint data comprises script code data describing script code for the script and script syntax data describing the script;
• determining, by the web browser, that the script fingerprint data is not described by local known script data;
• sending an anomalous script report by the web browser to the server, the anomalous script report comprising the script fingerprint data;
• and
• updating, by the web browser, the local known script data to describe the script fingerprint data.

A non-transitory machine-readable medium comprising instructions thereon that, when executed by a processor, causes the process to perform operations comprising:

• parsing, by a web browser executing at the processor, web content received from a server;
• identifying, by the web browser, a script associated with the web content received from the server;
• generating, by the web browser, script fingerprint data for the script, wherein the script fingerprint data comprises script code data describing script code for the script and script syntax data describing the script;
• determining, by the web browser, that the script fingerprint data is not described by local known script data;
• sending an anomalous script report by the web browser to the server, the anomalous script report comprising the script fingerprint data;
• and
• updating, by the web browser, the local known script data to describe the script fingerprint data.