how to prevent firefox andoid from downloading files？

[FateRover]

my father use tablet with firefox，though i have installed ubo for him，there are still some ads and some times the web site will ask for download apk which is actually spam，is there any argument in about:config that
prevent firefox down request?

[DanRaisch]

Moving to Mobile forum where the android version of Firefox is best discussed.

[kbrosnan]

Firefox does not have an about:config option to do that.

[mozillazinefor19#34_]

my father use tablet with firefox，though i have installed ubo for him，there are still some ads and some times the web site will ask for download apk which is actually spam，is there any argument in about:config that
prevent firefox down request?

Any or all of the options below might help.

Option #1:
In Android: Settings > Apps > Firefox
Install unknown apps: Not allowed

Option #2:
Check UBlock Origin Filter lists and maybe add some more.
In Firefox: Hit the 3-dot menu > Add-ons > uBlock Origin > Options
The addon NoScript is super, but it requires some management of a whitelist.

Option #3:
Hit the 3-dot menu > settings > Privacy > Clear private data on exit. If you click the text, instead of the checkbox you can configure what will be deleted. You can clear downloads.

Typing about:about is always educational. There is a about:downloads. If you long-press (equals mouse right-click) a file there is an option to delete them.

Option #4:
If you scroll to the bottom of this bug report, it mentions an addon, "Ask before you Download".
https://bugzilla.mozilla.org/show_bug.cgi?id=849630

[oliverzofia]

If you want to prevent Firefox android from downloading files then change the downloading settings of Firefox in the Settings section.