Help Foxit Reader 6.1.2.1224 open pdf's in FireFox ESR 24.2.0 tabs

[leoboy]

Newer PDF's open in Tabs , it appears older PDF's from my hard drive open in a new window . I would like all to open in tabs please ?

I could make Adobe do this , but i like the highlight text feature etc... in Foxit . Any help please ?