I use Epichrome to create a site-specific browser for Gmail. Clicking attachment icons in Gmail causes a new window to open in my system's default brower (Chrome), which I'd like to avoid. Epichrome Helper's "Custom Rules" should help here, but I can't figure out the right pattern to use.

Here are the two patterns I'm using:


for both rules, set "And would open in:" to "Either" and "Then open it with:" to "This app". But clicking attachments still causes them to open in my system's default browser.


I'm the author of Epichrome and have a Gmail SSB of my own. I've just confirmed that I'm able to view and download a PDF attachment from within the SSB without it trying to send the link to the default browser.

I don't have any rules specific to attachments, just a set of rules to keep Gmail links internal. Here's an export of my Epichrome Helper settings for my Gmail SSB:


If you want to try these, first export your own settings as a backup in case something goes wrong, then copy and paste my settings into a text document and import that into your Epichrome Helper on the options page. Choose "Replace" to overwrite your settings. Hope it helps!

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  • Wonderful! Thanks for the help. (And for Epichrome!) – Michael Jul 12 '16 at 18:18
  • Glad to help! If you find bugs or have feature requests, please don't hesitate to open an issue on the project's github page. – Dave Jul 12 '16 at 21:52

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