The current save password dialog (displayed via GtkInfoBar) reads as follows:

'Would you like to store the password for <user name> in <domain address>? [Not now] [Store password]'

I've attached a screenshot of the dialog.

There are a few things about this that make it difficult to understand:

 * The word 'store' is used instead of the more conventional 'save'
 * The use of the user name is potentially confusing and isn't necessary
 * Suggests that the password is being stored *in* the website - again, potential here for confusion
 * 'Not now' option - alludes to future behaviour without specifying what that behaviour will be. If not now, when?!
 * Lacks an obvious way to close the dialog. Again, this is unconventional.

There are some odd aesthetic things about the display of the dialog too: the central justification of the text doesn't align well with other interface elements and is contrary to convention (see the use of GtkInfoBar elsewhere).

A quick review of what other browsers do. Firefox:

'Do you want Firefox to remember the password for <user name> on <domain address>?' [Remember] [Never for this site] [Not now] [x]

Chromium:

'Do you want Chromium to save your password?' [Save] [Never for this site] [x]

Both indicate what it is that is doing the saving. Firefox reproduces the unnecessary reference to user name and domain. There are unnecessary buttons in the Firefox version: the close button and Not Now button do the same thing. Firefox also uses 'remember' instead of 'save'.

Chromium's is the best, imo: it is the shortest, simplist, and easiest to understand. I'd recommend adopting the same formula in Epiphany:

'Do you want Epiphany to save your password?' [Save] [Never for this site] [x]