Unable to highlight in page

[newt0311]

If reporting a bug:

1. Can you describe the problem and bug in more detail?
   On some websites, I'm unable to highlight or annotate the text.

2. How can we replicate the issue?
   Here's a website that doesn't work on desktop or mobile (possibly for different reasons...): http://www.bibliomania.com/2/9/77/124/21473/1/frameset.html

3. Expected behavior (i.e. solution)
   To be able to highlight and annotate the text.

4. Error stack (from extension crash page)
   I didn't see any errors in the console, etc... Just nothing seemed to happen when I tried to use any of the memex extension options.

5. Other comments
   Memex is great! One thing I do miss on the mobile version is an option to directly start annotating text. I have to save the page. Then close the browser window and go back into the Memex app and select annotate manually. It would be nice to have a button on the save screen to let me do this directly.

Thanks!