Contribution from extension : matching only the page targeted, not all pages starting by

[MaartenLMEM]

Problem
Currently, when an web extension user contributes it creates a mathing context too large. It target the page and all pages starting with same characters.
Currently it is not a problem because contribution team is moderating contributions before publishing.
Tomorrow with #459, it will be directly published.

For example
if I am on https://www.direct-assurance.fr/ when I contribute
it creates as matching context :

• websiste : www.direct-assurance.fr
• regex : /

Solution
Add /?(\?.*)?$ at the end of regex to not match with other pages of the same website
Fo example
if I am on https://www.direct-assurance.fr/ when I contribute
it creates as matching context :

• websiste : www.direct-assurance.fr
• regex : /?(\?.*)?$