Cant open firefow after downloading the program

I got this message
isntruction at ox784277a9 cannot be read
the memory at ox784277a9 cannot be read

Personally I would boot into recovery & reinstall the OS.
If it is new I assume you have nothing to lose (not migrated data to it). The default install option will only try to replace files in place anyway. Backup if you do have an valuable data.
oovoo & Dropbox both download as .dmg files (disk images). It suggests it could be similar to another issue I saw with 10.9 where the installed Disk Utility app appeared to be corrupt. Perhaps your Disk Utility 'diskmounter' helper is damaged.
The user had sucess with a reinstall.

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