In other words: JavaScript is a security risk when it is executed in PDF documents. Unfortunately, JavaScript in PDFs may also be used to execute malicious code. There are legitimate reasons for supporting JavaScript in PDF documents, for instance to verify the input in form fields or to make changes to a document based on data when it is opened or when certain events happen.

Mozilla enabled the execution of JavaScript in PDF documents in Firefox 88 this means that JavaScript code will be executed if it is present in a PDF file that is viewed in Firefox. The execution displayed the JavaScript document in the browser but ignored any JavaScript code that it contained. Up until now, JavaScript was ignored by Firefox when PDF documents were viewed in the browser. The security and feature update for the organization's Firefox web browser introduced a major change in the native PDF viewer of the browser. You can use a different browser profile for such a dedicated browser.Mozilla released Firefox 88 last month. Never use an old browser for public web pages, since the browser may have known, exploitable flaws. A typical use case may be an internal system which needs a Java plugin but is otherwise secured. You can still use an old and unsupported browser, but it may contain flaws and vulnerabilities which won’t be fixed. This will be the final option when Firefox 52 ESR reaches its end of life. To choose the default in Fedora Workstation, go to the Settings control panel, and select Details, Default Applications. You can have more than one browser installed. It also updates itself automatically when a new release is available. You can then register it as a default browser. Download and unpack the tar archive somewhere in your home directory and launch the browser. The Firefox 52 ESR binary package is provided from Mozilla site. However, at the end of this year Firefox 52 ESR ( Extended Support Release) is planned to be discontinued. This is the official to run NPAPI plugins by Firefox now. Then right click anywhere on the option list and add a new Boolean option named plugin.load_flash_only and set it to false.īe aware this entry could be removed anytime without further warning, and is strictly unofficial. In Firefox, enter about:config in the location bar, and confirm the warning dialog. Firefox 52 allows you to override the plugin block using a preference setting in about:config. Fortunately, Fedora users still have options to bypass that plugin ban.

The exception is Flash, but Firefox will remove its support in the future, too. The stock Firefox 52 browser disables these components. Some well known NPAPI plugins are Flash, Java, and the GNOME Shell web extension. NPAPI plugins are binary components integrated to the browser. Mozilla decided to stop supporting NPAPI plugins for Firefox browser two years ago.

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