Пользуюсь много лет. Помог с ассоциацией файлов utorrent (что бы не качать файл и не запускать отдельно, он сразу открывает файл в программе uTorrent). В самом браузере ассоциация работает криво и, по видимому, никогда это не починят. Альтернатив не видел.

Worked for me to open the ICA files from my company (opening with Citrix WPA).

It blocks downloading Gmail attachments. Clicking on pdf or jpg to download do nothing. Uninstalling helps.

Работает открывая торрент файлы на Firefox 69, автору спасибо и удачи!

Like it says, doesn't work everywhere :/

Now on FF68, it _still_ works like a charm - pure awesomeness! Thanks for your dedication! :)

Nicely done with a simple interface and well-documented, but doesn't seem to work everywhere. For example the .torrent files on http://hdreactor.info/ are still delivered as attachments with this extension active. Samlh, maybe you want to have look at this issue? I'd file a bug report but you don't seem to have a github or similar site.

I'm running Firefox 57 on Ubuntu 17.10.

EDIT: I've now replaced this extension with Header Editor (https://addons.mozilla.org/en-US/firefox/addon/header-editor/), a more generalized extension where I could quite easily define a rule to ignore those those pesky Content-Disposition: attachment headers on any website, including the one mentioned above.

I registered just to give this 5 stars. It's the only such addon I've found that both works on all the sites I use *and* is e10s compatible. Thanks!

I use it to display PDF files in gitlab. Without this extension, they are opened with an editor after download, with the extension they open with Firefox' internal PDF viewer.