Letterboxd collage

Paste the snippet into the console. Use lb.collage() to generate the collage, lb.savePage() to save the current page (for multi-page lists) then lb.loadPages() to load any saved pages (use savePage on each but the last page of the list, and then loadPages on the last page). lb.resetPages() will clear saved pages.

Once you have the collage you want, resize the browser window so that it's the size you want, and screenshot it. Firefox has a nice builtin screenshot feature that lets you screenshot the entire page, for instance.

(() => {
  window.lb = {
    collage() {
      const posters = document.querySelector("ul.poster-list");
      const body = document.querySelector("body");
      posters.parentNode.removeChild(posters);
      body.innerHTML = "";
      body.setAttribute(
        "style",
        "background-color:#14181c; background-image: none;",
      );
      posters.setAttribute(
        "style",
        "padding-right:1em; padding-left:1em;padding-top:1em;justify-content:normal !important; pointer-events:none; user-select: none;",
      );
      body.append(posters);
    },
    _getFromLS() {
      let saved = localStorage.getItem("lbCollageSaved");
      if (saved !== undefined && saved !== null) {
        saved = JSON.parse(saved);
        if (Array.isArray(saved)) {
          return saved;
        }
      }
      return [];
    },
    savePage() {
      let pages = this._getFromLS();
      const posters = document.querySelector("ul.poster-list");
      pages.push(posters.innerHTML);
      localStorage.setItem("lbCollageSaved", JSON.stringify(pages));
    },
    loadPages() {
      const posters = document.querySelector("ul.poster-list");
      let pages = this._getFromLS().join("") + posters.innerHTML;
      posters.innerHTML = pages;
    },
    resetPages() {
      localStorage.removeItem("lbCollageSaved");
    },
  };
})();