Improve coverage of ABP cosmetic filters

[gorhill]

A meta issue just to keep track of changes related to coverage improvement of ABP cosmetic filters.

Currently coverage is (based on latest EasyList):

• 20866 accepted
• 3221 rejected
• coverage: 86.6%

[To do: Create a list of selectors to address, starting with most-used first]

[gorhill]

mail.google.com##.nH.adC > .nH > .nH > .u5 > .azN is not collapsed. I expected that I would need a mutation observer. I think I will just merge the content script for cosmetic filters with the main content script which already implements a mutation observer. This one element hiding filter might be the most sought after.

[gorhill]

fded043 takes care of embedded gmail ads (as far as I could test with my never-use gmail account).

[gorhill]

Found 2,908 matches for cosmetic filters in the form:

[hostname]##[element]

Given that these filters are narrowed to a single domain, it's quite easy to implement. Will call them FilterElementHostname, and that should bring coverage to 98.7% before the end of the day.

[gorhill]

With 83e213c, coverage is 99.0%:

• 24087 filters processed
• 23849 filters accepted

[gorhill]

Latest fine tuning work, d734e42, improved coverage to 99.4%:

• 24087 filters processed
• 23935 filters accepted