You might try this extension: https://github.com/andreicristianpetcu/google_translate_this It does the same thing in the same way as Page Translator and likely will be blocked by Mozilla, but this is a cat and mouse game worth playing if you rely on full-page in-line language translation.

If you need a tool to backup your documents and files please take a look at the excellent BackInTime application which is more configurable and provides options for saving user files.