Refactor/extension unification

[vringar]

[englehardt]

I did a quick review and this LGTM. Do we know why the tests aren't running?

[vringar]

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[codecov-commenter]

Codecov Report

Merging #983 (6664d73) into master (65c284b) will decrease coverage by 2.94%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #983      +/-   ##
==========================================
- Coverage   52.53%   49.58%   -2.95%     
==========================================
  Files          34       34              
  Lines        3392     3392              
==========================================
- Hits         1782     1682     -100     
- Misses       1610     1710     +100     

Impacted Files	Coverage Δ
openwpm/deploy_browsers/deploy_firefox.py	24.39% <0.00%> (ø)
openwpm/utilities/db_utils.py	66.66% <0.00%> (-30.00%)	:arrow_down:
openwpm/utilities/multiprocess_utils.py	28.57% <0.00%> (-26.20%)	:arrow_down:
openwpm/js_instrumentation.py	73.11% <0.00%> (-22.59%)	:arrow_down:
openwpm/errors.py	80.95% <0.00%> (-19.05%)	:arrow_down:
openwpm/config.py	84.92% <0.00%> (-11.12%)	:arrow_down:
openwpm/browser_manager.py	68.34% <0.00%> (-6.54%)	:arrow_down:
openwpm/task_manager.py	76.44% <0.00%> (-3.12%)	:arrow_down:
openwpm/command_sequence.py	90.76% <0.00%> (-3.08%)	:arrow_down:
openwpm/commands/utils/webdriver_utils.py	19.31% <0.00%> (-2.28%)	:arrow_down:
... and 1 more

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