Good Dev tools

Useless. don't even know how to use. Avoid.

This is a very very important extension for web designers and developers, in my opinion. Absolutely great for pixel-perfect designs.

A really practical tool, I'm not giving 5 starts because sometimes the lines get duplicated and I have to reload the page to make the disappear, other than that great tool.

Not very flexible. Would be more useful if you could define max-widths, auto columns, percentages (not just pixels).

Upon using it for a second day, it didn't even remember the settings from the last day. So any time spent creating grids, be prepared to lose them.

Great add on to test and implement grids. Really usefull!

Two things I miss:

1. The grids I create are not saved?
2 Option to add and define a left and right margin/gutter. Often a grid will have a margin on eather side. E.g. if the gutter is 30px it typical to have a 15px margin. It would be great to see this too. See what I mean here:
https://i.imgur.com/rGCOrCC.png

Je m'en sers surtout pour les repères. Combinés avec la règles native de Firefox, c'est juste PARFAIT. Merci ;)

Nice try, but without the possibility to have fluid columns is pretty unuseful if you have to replicate a bootstrap 4 grid.
Add the possibility to set the number of columns and not the width in pixels.
The ideal would be to have number of columns and gutter width in pixel, so the width of the columns is fluid and they resize with the viewport.
Also add the possibility to set the first and last gutter to be half wide (or just see how bootstrap 4 works and add the gutter width to the left and right of every column)

this is what exactly I'm looking for jeremie. Thanks a lot :)