Rated 5 out of 5 stars

UPDATE: My apologies! Today, in my add-ons list, PCPS showed as waiting for a restart to update. I have no idea what happened or why, but it's working fine now. Hallelujah! :D

Just switched to Firefox 51.0.1 and for the first time in years, PCPS won't run. Keeps telling me it failed to save image because of a "file type error." It's always been one of my favorite tools, hate to see it die.

This review is for a previous version of the add-on (2.8.8). 

I am sorry about this problem. Is multiprocess mode (also known as electrolysis or e10s) enabled in your Firefox? If it is, you will need to turn it off in order for Page Saver to work correctly. To disable multiprocess mode, open the about:config page and set both of the following preferences to 'false':
browser.tabs.remote.autostart
browser.tabs.remote.autostart.2
Restart Firefox after changing these preferences.

We are working on a new multiprocess compatible Page Saver (based on the new WebExtensions API) but it is not yet available from addons.mozilla.org.

Rated 5 out of 5 stars

One of my handful of indispensable FF extensions for many years now. Nothing else I know of offers the same functionality, specifically "save image of entire page." And it's been trouble-free on Macs both old and new.

This review is for a previous version of the add-on (2.8.2.1-signed).