Hash type dropdown seems inaccessible by tab key

[katrinleinweber]

Your DownThemAll! and Browser Version and Language and Operating System

DownThemAll! 3.0.8 in Firefox 56.0 in English on macOS 10.13

Expected Behavior

I think it would be neat if after pasting a hash value into the checksum.value field,

• either the hash type would be detected automatically (if at all possible),
• or hitting the tab key would jump the selection to the dropdown menu so one could at least select the type quickly.

Actual Behavior

Tab-ing jumps the selection to the top. It seems to be impossible to access the hash type dropdown with the keyboard.

Steps To Reproduce

1. select any Download in DTA!'s list
2. press alt + I
3. click Options
4. click the Checksum (Hash) field
5. press tab key repeatedly, and try shift + tab as well