We've updated the beta version of the Push to Kindle extension for Chrome and Firefox.
It addresses an issue where Push to Kindle will fail to redirect you to the preview screen. If you experience this problem, you'll see the 'Loading Push to Kindle...' message appear, but nothing then happens.
It only affects some sites, so you might not have experienced this. If it does affect you, please try our beta extension and let us know if you still have trouble.
Those of you who have our beta extension already installed (you'll see a 'beta' label on the toolbar button if you do) can update it via your browser to get the latest version.
If you experience any difficulties with the beta extension, please do let us know.
Note: you can have both the beta and standard extension installed side by side. They do not interfere with each other.
Technical explanation
The main change here is in how we send the web page content to the Push to Kindle service. Previously, when you clicked the toolbar button, code was inserted into the page to submit the content to our server.
Some sites (but very few in our experience) implement a content security policy to prevent browsers from carrying out such submissions. The intention is to prevent outside code that neither the visitor nor the site has approved getting executed on the page.
These policies are not intended to limit browser extensions such as ours, but the way we had implemented the content submission procedure (doing it within the context of the loaded page) meant that those content security policies were being applied to Push to Kindle too.
To avoid this occurring, the updated beta version now sends the content outside the context of the loaded page.