ABP Subscription Links Not Understood

[pjpreilly]

Filter issues MUST NOT be reported here. Read first: https://github.com/gorhill/uBlock/blob/master/CONTRIBUTING.md

Describe the issue

Trying to add filter subscriptions from filterlists.com. Clicking add returns an error for ABP protocol. This is the only OS I have the problem on. Works fine on Windows 10 as well as any OS x I've tried. Also Adblock plus works fine on this OS on both browsers. This problem occurs without Adblock Plus enabled/Installed.

One or more specific URLs where the issue occurs

abp:subscribe?location=https%3A%2F%2Feasylist-downloads.adblockplus.org%2Fadwarefilters.txt&title=Adware%20Filters (This is the exact URL)
[URL(s) for issue on a specific site are mandatory]

Screenshot in which the issue can be seen

[Screenshot(s) for visual issues are mandatory]

Steps for anyone to reproduce the issue

Go to the filterlists.com website
Click ADD to any filter subscription
observe error (Picture)

Your settings

[If you fail to provide this info, I will mark the issue as invalid. Lists all settings which differs from default settings]

• OS/version: Manjaro (32 bit) latest stable (rolling release Xfce desktop)
• Browser/version: Firefox 52.1.0 esr (as well as Chromium 58.0.3029.110-1)
• uBlock Origin version: 1.12.4

Your filter lists

NA
[Example: "Default filter lists + FRA", or "Default filter lists minus uBlock -- Badware risks"]

Your custom filters (if any)

NA

[gwarser]

Using left mouse button? This happens when opening in new tab, because is handled by content script.

[gorhill]

Timing issue, already reported at: collinbarrett/FilterLists#79 (comment).

Potential solution: adding a (1 second?) delay before checking for abp: links on the page.

[pjpreilly]

@gorhill Would/should pre-loading filterlists.com first with Ublock disabled & the enabling Ublock have any affect on the timing? Would you expect this to be a work around?

UPDATE: It is a work around & does confirm the timing issue.