Saved Images go to default Download Folder and some Filenames are broken

[KernSani]

Hi, the firefox add-on works really great, I just noticed two issues:

1. If "Always show Save As dialog" is switched on, I ca select a destination folder, however the images still go to the default download folder
2. Images that have spaces in the filename seem to be escaped differently in markdown and in the filesystem. Space is escaped as %20 - in the filesystem it becomes _20, however in markdown file the % is escaped again, so it becomes %2520.

Thanks,

Oli