Counterarguments

Who care about efficiency, I have 8 GB

Doing more with less is a virtue in software. For users of µBlock, this means:

• Page loads faster
• Free to use more filter lists
  • For instance, ABP warns against using too many filter lists: "It is important to note that you should not add too many filterlists to Adblock Plus"
• Free to use a blocker on less powerful devices
  • For instance: Reddit: "ABP was a significant burden on my CPU"
• Free to use more extensions

Memory and CPU cycles are finite resources. A sure way for a developer to not be hired when being interviewed is to dismiss efficiency work because "memory is plentiful" or "CPU nowadays are fast enough".

µBlock is a fork of Adblock Plus code

No. Code is wholly original, it was written from scratch. There are a very few places I borrowed code from elsewhere, and this is clearly identified. For example, for the element picker, I embedded CSS.escape from Mathias Bynens.

Adblock Edge is as light as µBlock

No it's not. Adblock Edge is exactly like Adblock Plus, except that it doesn't have the "Acceptable ads" exception filters out of the box. See for yourself: here is a diff of a code change for Adblock Edge, and here is the same exact diff for Adblock Plus. The timestamps shows that Adblock Edge pulled code changes from the Adblock Plus project.