It's not a security issue for sandboxed Firefox, but Foxit Reader users should run Foxit's Update Check (unsandboxed), and install the latest Firefox add-on (plug-in): 2.2.3.111.
You can check your plug-in version with Tools > Add-ons > Plugins
Mozilla had blocked the Foxit Reader plug-in v2.2.1.530 and earlier, after a vulnerability was found.
If you have used your Firefox profile often enough for the 'blocklist.xml' profile file to have been updated, and use the Firefox phishing template in your Sandbox Settings (as you should), then having one of the affected plug-in versions will keep .PDF files from being displayed in a Firefox window.
Those files will not open in Firefox, but they will open in a Foxit Reader window if Foxit is your default viewer. Of course, the Foxit window will still be sandboxed, if the browser was running sandboxed, so it's not a big issue as long as you are running Firefox under Sandboxie.
Foxit Reader users should update their Firefox plugin
Foxit Reader users should update their Firefox plugin
Paul
Win 10 Home 64-bit (w/admin rights) - Zone Alarm Pro Firewall, MalwareBytes Premium A/V, Cyberfox, Thunderbird
Sandboxie user since March 2007
Win 10 Home 64-bit (w/admin rights) - Zone Alarm Pro Firewall, MalwareBytes Premium A/V, Cyberfox, Thunderbird
Sandboxie user since March 2007
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