Theme developer module crashes the whole site when enabled, how to fix?
I did manage to get it to work properly … eventually. This is how, on D7 7.5.


Download and install Theme Developer 7x. Do not enable yet. 
Download and install SimpleHTMLDom  7.x-1.12. Do not enable yet.
Download SimpleHTMLDom library from
http://sourceforge.net/projects/simplehtmldom]1 and install to
sites/all/libraries, so that your library path is
sites/all/libraries/simplehtmldom/simple_html_dom.php.
Now you can run drush en -y devel_themer and it will automatically
enable the simplehtmldom.


I did notice that my /tmp folder was not giving correct permissions to the /tmp/devel_themer folder, so doing a chmod -R on that fixed the problem.